So my parents who are quit old have an old laptop that I have been maintaining for them . While they don't use it often they have used it for some banking and paying of some bills . The specs are as follows
2ghz dual core
4 Gb ram maxed out
250 GB SSD drive
windows 7 32 bit
advast anti virus free version

that SSD drive allows it to run quit efficiently

Security is my concern from the prospective of both the OS and anti virus.
So should I take this old system to windows
8.1 32bit or 8.1 64bit or
10 32bit or 10 64bit ???
I'm leaning to 8.1 32bit

Also i don't feel I can trust Advast . I' considering either using Microsoft defender or Comodo . both are free