Sorry, another one of those "I know it's OT but I trust you guys..."
I Just bought one of the kids a PC in Office World (It's a long story) pentium 4 with via chipset and one of those awful space saver keyboards (with editing and arrow keys in the main block of keys). The keyboard also has lots of extra buttons for volume, etc.
It seems that any game (ie all that we've tried so far) that use the arrow keys (maybe other keys as well) exhibit the same problem. If the key is held down the game freezes. When the key is released it starts again. All of the games run perfectly OK on other machines.
I can't get back to the shop until the weekend so I'm looking for ideas. The obvious one is to try another keyboard which I'll do tonight.
MBQ