I have a Dell studio 1558 running Win 7 Enterprise and have a very frustrating problem with it and need some help. I contacted Dell support that was a joke. What's happening is when you are trying to type an email the cursor will just jump to wherever it ends and if you don't watch it closely you will be over typing from wherever it ends up. This isn't a virus as it does it from a fresh re-install and I also had this problem with an Acer lap top and is the reason I bought this. This is a very, very frustrating and I have wanted too jump up and down on it laughing madly. Any help will be greatly appreciated in resolving this issue.