New Pc

Alright so, I bought a new computer and now I have downloaded every thing.

So when ever I try to join a server I get little purple-black texture boxes and error signs but on my old computer this does not happen?
If some one could tell me how one fixes this it would be great.
AND YES COUNTER STRIKE AND TF2 ARE INSTALLED!
One more thing I just tried to join the same server but its making me reinstall everything every time I join?.. btw the server is lifepunch


(User was banned for this post ("Wrong section / UTT" - Craptasket))