Steam account used elsewhere??!?!?! Help

Just bought Gmod today and everytime i try join any multiplayer game it tells me that,
This Steam account has been used to log in elsewhere. To continue using steam you need to log in again.

Ive got no idea why it gives me this error? TF2 works fine
btw. Only game i got besides this is TF2, So would i need other packs to play on the servers or should it just download what i dont have?

Just to add my specs are
Intel Pentium 4 @3.0Ghz (Dual)
Nvidia Geforce 6600 (256MB)
2GB Ram
Tons of free diskspace

Im pretty sure it aint my specs though, any idea why is to this is happening?

I recommend you to change your steam account password just to make sure that nobody else is using your account.

  1. Exit Steam
  2. Goto > C:\Program Files\Steam\
  3. Delete ClientRegistry.blob
  4. Restart Steam
  5. Put in details in steam.
  6. Login

Easy fix.

This happened to me and I did BOTH of the above suggestions to get my Gmod working. Good luck.

You logged in using your account somewhere else?

You know that really, REALLY doesnt help me at all…
Ty to the other guys though it works now!!! XD
Now all i need to do is get a bigger dl cap limit

It won’t download game content, but it will download addons. So, if you don’t have PHX and Wire, brace for years of DL