Wits end

I run XP-SP2, IE7.

Having problem w/J2SE - can't remove. Tried using Add/Remove program but get following:
Error 1316. A network error occurred while attempting to read the file C:/Windows/Installer/J2SE Runtime Environment 5.0 Update 6.msi.

Also:
1)Key strokes don't always take - sometimes letters don't get entered until I hit key a second time.

2)Some gaming programs run very jerky.

3)Web pages using Java gives pop-up "The page you are viewing uses Java." (Java(TM)6 update2 is installed and verified).

4) tried system restore but even that won't work ("Unable to restore")

I've run: RegistryFix, RegMech, Registry repair, SuperAntiSpyware, Windos Defender to no avail.

System used to work great but is now awful. No knew programs added (knowingly).

If anyone can offer help - ple e-mail to cato0212@iowatelecom.net THANKS A MILLION