Sounds like it could be something wrong with the tab key, you might want to try another keyboard.
Once in awhile the tab button works, but it seems most of the time it hasnt been, lately. Its kind of a handy button to have...
The OS is WinMe, and the puter is by HP. The keyboard is original equipment.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic