The game runs by default at 800*600, so you can try those 2 things:

1. set the Hz for 800*600 to 60 in your videcard drivers-menu

2. go to [start] > [Run...] > type regedit > see under current user/software/troika/vampire/settings > and change the screenheight to 768 and screenwidth to 1024

could help

(The problem is, you're probably running on a LCD screen and your Hz aren't on a default setting.)

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