Started happening a couple of weeks back, now its total pot luck if i can get to play TF2 - most of the time it happens, sometimes it doesnt 
It hangs at the first screen you get when you join a server, says CONTINUE at the bottom right - audio is stuck in a loop.
Once in a game it never crashes, but i have noticed recently that if i Alt-Tab out of a game, i can no longer Alt-Tab back into it - or get back into it any other way - that never used to happen
I have tried it on the 64bit versions of both Vista and Win7
Ive tried deleting the registry.blob file - that just reinstalled steam, tried changing fx settings but that doesnt help, nothing is overclocked.
Anyone else having similar problems or is it just me :/

It hangs at the first screen you get when you join a server, says CONTINUE at the bottom right - audio is stuck in a loop.
Once in a game it never crashes, but i have noticed recently that if i Alt-Tab out of a game, i can no longer Alt-Tab back into it - or get back into it any other way - that never used to happen

I have tried it on the 64bit versions of both Vista and Win7
Ive tried deleting the registry.blob file - that just reinstalled steam, tried changing fx settings but that doesnt help, nothing is overclocked.
Anyone else having similar problems or is it just me :/