|We do not work on Windows Computers. If you have a Windows Machine that is having issues the best advice I can offer is to switch to MAC.|
If you are facing the inevitable upgrade from Windows XP to Windows 7 Choose MAC instead.
If you want to get as much return on investment as possible from your XP machine, get Malwarebytes Pro, Anti Malware here. Make sure you activate it, and schedule updates and scans.
Completely remove ALL other Antivirus products.
Below are some videos that will help you keep you machine running as efficiently as possible.
This is what I used to do to keep my Windows machines running well.