Am Trying to Upgrade from Vista Ultimate 64 (All Updates incorporated) to Windows 7 64 bit.
Have no compatibility issues. Registry has been cleaned and optimised. Check Disk performed on c:\ (No errors)
Am performing the upgrade from the Administrator LogOn so User Control is not an issue.
System is backed up through Windows Home Server.
System Details:
OS Name Microsoft® Windows Vista™ Ultimate
Version 6.0.6002 Service Pack 2 Build 6002
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name MAIN
Motherboard ASUS
Motherboard Model M3N78SE
System Type x64-based PC
Processor AMD Phenom(tm) II X4 940 Processor, 3000 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 0602, 13/01/2009
SMBIOS Version 2.5
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United Kingdom
Hardware Abstraction Layer Version = "6.0.6002.18005"
User Name Main\Administrator
Time Zone GMT Standard Time
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 4.00 GB
Available Physical Memory 1.81 GB
Total Virtual Memory 9.91 GB
Available Virtual Memory 6.87 GB
Page File Space 6.00 GB
Page File I:\pagefile.sys

I run the setup programme, do online update (OK), Compatibilty Check (No Issues)
Programme then loads files (Creating three directories on C:\)
Immediately that files are downloded it goes to next action and immediatetely goes to:
The Upgrade Was Cancelled
Any changes that were made to your computer during the upgrade will not be saved.
Setup can't continue, Restart the computer and restart Setup. When prompted try getting the latest updates.

Have tried over ten times with the same result on each occasion.

PLease do not suggest a clean install this is a home\office system and I haven't enough time left in my life to reload everything from scratch including all of the updating that goes with it on my 1.5mb broadband.

The end of the Panther Log (Full version available if required) is:

2009-11-20 09:41:24, Info [0x080073] MIG Migrate: Migration side is: source
2009-11-20 09:41:24, Info Entering UpgCanMigrateToThisSystem method
2009-11-20 09:41:24, Info [0x08034c] MIG UpgCanMigrateToThisSystem: detected OS version: 6.0.6002 Service Pack 2
2009-11-20 09:41:24, Info Leaving UpgCanMigrateToThisSystem method
2009-11-20 09:41:24, Info MIG Migrate: Upgrade is using replacement manifests in C:\$WINDOWS.~BT\Sources\ReplacementManifests
2009-11-20 09:41:24, Info [0x080075] MIG Migrate: Initializing migration engine in online mode
2009-11-20 09:41:24, Info Entering UpgStartUp method
2009-11-20 09:41:24, Info [0x0803ac] MIG Initializing online WinNT platform (Read Only)
2009-11-20 09:41:24, Info MIG Platform is using admin privileges
2009-11-20 09:41:24, Info [0x0803df] MIG Adding direct mapping from HKLM to HKEY_LOCAL_MACHINE (R/O)
2009-11-20 09:41:24, Info [0x0803e1] MIG Successfully mapped HKLM
2009-11-20 09:41:24, Info [0x0803df] MIG Adding direct mapping from HKU to HKEY_USERS (R/O)
2009-11-20 09:41:24, Info [0x0803e1] MIG Successfully mapped HKU
2009-11-20 09:41:24, Warning [0x08040b] MIG State data store failed calling CoInitializeEx in apartment-threaded mode. (hr = 0x80010106)
2009-11-20 09:41:24, Info [0x08040e] MIG State data store is available.
2009-11-20 09:41:24, Warning [0x080262] MIG GAC data store failed calling CoInitializeEx in apartment-threaded mode. (hr = 0x80010106)
2009-11-20 09:41:24, Info [0x0803b4] MIG COnlineWinNTPlatform: ComputerName=MAIN
2009-11-20 09:41:24, Info [0x0803b5] MIG COnlineWinNTPlatform: Get Machine Sid S-1-5-21-2661779917-3657288831-154045754
2009-11-20 09:41:24, Info [0x0803b8] MIG Processing profile: C:\Windows\system32\config\systemprofile
2009-11-20 09:41:24, Info [0x0803bf] MIG User profile HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-18 excluded because SID S-1-5-18 is excluded by default.
2009-11-20 09:41:24, Info [0x0803b8] MIG Processing profile: C:\Windows\ServiceProfiles\LocalService
2009-11-20 09:41:24, Info MIG Could not retrieve SID from 'HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-19 [Sid]'. Assuming 'S-1-5-19' (from 'HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-19') to be a valid SID
2009-11-20 09:41:24, Info [0x0803bf] MIG User profile HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-19 excluded because SID S-1-5-19 is excluded by default.
2009-11-20 09:41:24, Info [0x0803b8] MIG Processing profile: C:\Windows\ServiceProfiles\NetworkService
2009-11-20 09:41:24, Info MIG Could not retrieve SID from 'HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-20 [Sid]'. Assuming 'S-1-5-20' (from 'HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-20') to be a valid SID
2009-11-20 09:41:24, Info [0x0803bf] MIG User profile HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\S-1-5-20 excluded because SID S-1-5-20 is excluded by default.
2009-11-20 09:41:24, Info [0x0803b8] MIG Processing profile: C:\Users\Colin A Roberts
2009-11-20 09:41:24, Info MIG Querying for user data from the blackboard at Upgrade\UserData\S-1-5-21-2661779917-3657288831-154045754-1000
2009-11-20 09:41:24, Warning MIG Failed to retrieve cached user name from the blackboard.
2009-11-20 09:41:24, Warning MIG Failed to retrieve cached user domain name from the blackboard.
2009-11-20 09:41:24, Info MIG Setting user data in the blackboard at Upgrade\UserData\S-1-5-21-2661779917-3657288831-154045754-1000
2009-11-20 09:41:24, Info [0x0803e2] MIG Adding indirect mapping from HKCU to <C:\Users\Colin A Roberts\NTUSER.DAT> loaded at HKEY_USERS\S-1-5-21-2661779917-3657288831-154045754-1000 (R/O)
2009-11-20 09:41:25, Info [0x0803e4] MIG Successfully mapped HKCU
2009-11-20 09:41:25, Info [0x0803e2] MIG Adding indirect mapping from HKCU\Software\Classes to <C:\Programmes2\Users\Colin A Roberts\AppData\Local\Microsoft\Windows\UsrClass.d at> loaded at HKEY_USERS\S-1-5-21-2661779917-3657288831-154045754-1000_Classes (R/O)
2009-11-20 09:41:25, Error [0x0803dc] MIG IndirectKeyMapper: RegOpenKeyEx(HKEY_USERS,S-1-5-21-2661779917-3657288831-154045754-1000_Classes,R/O) failed (5)[gle=0x000003f0]
2009-11-20 09:41:25, Error [0x08039d] MIG Cannot add mapping for user profile C:\Users\Colin A Roberts. Error: 5: Win32Exception: Access is denied. [0x00000005] __cdecl Mig::CIndirectKeyMapper::CIndirectKeyMapper(class UnBCL::String *,struct HKEY__ *,class UnBCL::String *,class UnBCL::String *,int,const Mig::HiveLoadRetryOptions *)[gle=0x000003f0]
2009-11-20 09:41:25, Error [0x080801] MIG User profile loading error. Aborting due to external request.[gle=0x000003f0]
2009-11-20 09:41:26, FatalError [0x090001] PANTHR Exception (code 0xE06D7363: <unknown>) occurred at 0x0000000076D176FD in C:\Windows\system32\kernel32.dll (+00000000000176FD). Minidump attached (107341 bytes).
2009-11-20 09:41:26, Warning [0x0803de] MIG Failed to unload hive at HKEY_USERS\S-1-5-21-2661779917-3657288831-154045754-1000 (error 1314)
2009-11-20 09:41:26, Warning [0x0809cd] MIG Failed to close keymapper 'HKCU': error 1314
2009-11-20 09:41:26, Warning [0x0803de] MIG Failed to unload hive at HKEY_USERS\S-1-5-21-2661779917-3657288831-154045754-1000 (error 1314)
2009-11-20 09:41:26, Error [0x0802fa] MIG UpgStartUp caught exception: Win32Exception: User profile loading error. Aborting due to external request.: The specified user does not have a valid profile. [0x000004E5] void __cdecl Mig::COnlineWinNTPlatform::ProcessUser(class Mig::CRegistryDataStore *,class Mig::CRegistryDataUnit *,class UnBCL::String *,class UnBCL::String *,int)
2009-11-20 09:41:26, Info Leaving UpgStartUp method
2009-11-20 09:41:26, Info MIG Migrate: migration operation failed (MigResult=4)
2009-11-20 09:41:26, Info [0x08008c] MIG Migrate: Shutting down with cleanup..., gle:0
2009-11-20 09:41:26, Info MIG UpgShutDown returning immediately, since the facade is not initialized
2009-11-20 09:41:26, Info [0x08008d] MIG Migrate : Finished (0)
2009-11-20 09:41:26, Warning [0x0800ad] MIG Callback_GatherOldSys: Migrating to (C:\$UPGRADE.~OS\OnlineMigStore) did not finish successfully
2009-11-20 09:41:26, Info MIG PublishCriticalError: Setup can't continue. Restart the computer and restart Setup. When prompted, try getting the latest updates.
2009-11-20 09:41:26, Info [0x0a013d] UI Accepting Cancel. Exiting Page Progress.
2009-11-20 09:41:26, Info UI Entering Page Cancel.
2009-11-20 09:41:26, Info UI Some issues soft appcomapt
2009-11-20 09:41:26, Info UI Shouldn't be here for drv issues
2009-11-20 09:41:26, Info [0x0a0035] UI Allowing Page 'App Compat' to be shown
2009-11-20 09:41:26, Info UI Some issues soft appcomapt
2009-11-20 09:41:26, Info UI Shouldn't be here for drv issues
2009-11-20 09:41:26, Info [0x0a0035] UI Allowing Page 'App Compat' to be shown
2009-11-20 09:41:26, Info [0x0a011c] UI WizardDialogPost::SetActive

Pease help: I have been using Windows RC7 on another machine and found it excellent and a great improvement on Vista - but it looks as though I will be a prisoner of Vista for the future.