Helpful things to do to get your computer to work right.
If it was working right a day ago or a week ago or more and it don't work right now-
Run System Restore Takes about 15 minutes
Start Button
Help & Restore
Click on System Restore
Select when you want it restored to
 
Disc Cleanup Takes about 15 minutes
Start Button
All Programs
Accessories
System Tools
Disc Cleanup
 
Defragment  Takes about an hour
Start Button
All Programs
Accessories
System Tools
Defragment
 
Error Checking Takes abour 15 minutes
Start Button
My Computer
Right click on C Drive
Properties
Tools
Error Checking
Check Now
    I Uninstalled AVG      
Click and read the link below
http://tallpinesnpr.com/john_toro.htm
I updated from Internet Explorer 7 to IE 8  free
http://www.microsoft.com/downloads/details.aspx?displaylang=en&familyid=341c2ad5-8c3d-4347-8c03-08cdecd8852b
If you do the system scan it takes 8 hours. Do it before you go to bed.
Takes some getting used to but it’s a good deal.