hi:

goto
www.antivirus.com
and look for the free online virus scanner
you might have a virus

also if the files you have are from the internet than you might have incomplete file download problems

try a download manager to see if that helps

also try winrar to unzip or unace

via chipsets also have a problem with sblive cards and data corruption occures

this is just some of the possible causes you may have

hows the cpu?
are you overclocking?

bad memory speed also leads to data corruption

im sure your problem is simple so i dont want to alarm you

egghead