Somybody please help me with this!

[s.o.t.n.]

I have a problem with Homm3 (Heroes of might and magic) - Armageddon's Blade. I made a backup long time ago, and it worked fine with GCW's patch in Windows 98, but not in Windows 2000. When I try to start the game, a note comes that says "there's a problem and it will be terminated, error log will be displayed"... or something.
Also my F-Prot found an "unknown virus" from the h3blade.exe
Can someone please help me? I'm a big fan of homm (thank god homm4's coming, and I'd like to get it work...
Sorry 'bout my english... I'm from Finland, thank you already everyone!