Hmm,.....zip files.....hmmm......they might open more than you wish for:

Check your system using any of these programs (I reckon using all of them):
http://www.lavasoftusa.com/software/adaware/(free)

http://www.grisoft.com(good free AVG)

http://www.ewido.com(>>now called AVG Anti Spyware<< free 30 day trial -the best in my opinion)

http://www.ccleaner.com/download/(free)

Spybot - Search & Destroy (FREE)

As for the Avi file ( a video format), it should actually be opened by using yur default media player (usually WMP or WinAmp), unless it is a bogus file....

Cheers
FOTH

__________________

"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"