Get Neverwinter Nights (currently Playing, as I never really started off with it) and then Neverwinter Nights 2, amazing RPGs, as for Baulders Gate, I've got that for game cube, it has better graphics that NVWN (Well the first one) but I didn't think it matched up to it in any way which was disappointing.
American McGee's Alice, its a platform game for PC, based on the quake engine, the graphics are out of date, but its a good game if you go for horror/platform games, you basically play as Alice returning to wonderland, but the world has turned upside down and everything is cruel and bloody, armed with a kitchen knife you go around to find out what the hell happened.
If you don't mind retro, grab James Pond: Robo Cod, I loved that game as a kid, and it has made a come back on PS2, absolutely a legendary game.
Broken Sword 1,2,3 and 4
All brilliant mystery games, I think the first one is the best. (PC)
Monkey Island 1,2,3 and 4
1&2 are DOS
3 is PC, I don't know about XP
4 Should run on XP.
Some of the best games of all time, playing as wannabe pirate Guybrush threepwood, game play is similar to Broken Sword.
As for most recent games, well I'm behind on those except a few decent FPS, RTS and Racing games, but I've read your posts and if I were to say Doom 3, I'd know to watch my back
"Cut down the gods if they stand in your way" - Yamamoto Tsunetomo