ERRORS ???? with joining games

[Fred]

I am joining games and it say your system thingy has been modified u cant play on this server cause of this modification
code[16]

 

[GMan]

Did you replace any models or sprites with something weird?

 

[Fred]

nup

 

[GMan]

Does this happen on all servers?

 

[Emeka650]

possibly you need half life 1.1.1.0 patch

 

[bata]

could also be just a bad installation. . .

 

[Reptile]

does it say what files?
i have xperienced diffelculties with an .wav in my cs folder
if you just delete the file the server will provide you with the new file