General Controls GR The Original

[Westnecker]

I realize this is an old game, but it's still out there, and I'm playing it for the first time! My problem is trying to change weapons. General controls says to use the "tilde" key for this purpose, but nothing happens. I've tryed using other keys, but still nothing. Everything else seems to work fine. Would playing it with a Vista Operating system be the cause? If so I'll never be able to complete all the missions.
Any help appreciated.

[Spearmeat]

The Tilde key works for me, and I am using Vista 32 bit OS.