it's actually quite a unique program. mobbman has done a great job in making it, however with the logic bomb in every single copy since 1.9 it is only a matter of time before you have problems w/ your pc .. win95 - win 98 2nd edition are vulnerable to a sub 7 attack.. however i do not beleive winME or XP can be infected properlly do to the anti ax built in the os..