Client DLL error?

[Fuse Kazuki]

Hey guys, whenever I start up Sven Coop to try to play it'll give me a missing client.dll error. This is the full error I got: Could not load library C:\Program Files\Valve\Steam\Steamapps\myusername\Half-Life\Sven Coop\cl_dlls\client.dll. Whats going on? I got this error two times already today, and its making me mad. I already reinstalled my Sven Coop, play it for awhile then I have to goto a party. Then I come back, try playing it and it gives me it again?? What do I do, I know I'm not going to reinstall Sven Coop all day and get all my models back. Is anybody else getting this? I know two others that got this and one of them is playing right now. But how do I fix it??
My friend said I should uninstall, then defrag and under options to tell it to delete fragmented files then reinstall a patch, or I could just f disk my drive completly for no reason, which one should I do?
You guys may not know much about Sven Coop or even like it but, I posted in SnarkCafe and in Sven Coop and noone knew how to fix this error, so I thought I'd post here for help. Thanks for the help.

 

[Zappathefappa]

I think I used to get that same error way back when with cs 1.5 when I first installed - think it had something to do with my version being out of date or something.
Do you get this error just when joining a multiplayer server or do you also get it when hosting? (if it was a version problem you'd be able to host your own game properly).
I don't think defragmenting would help - assuming this is the same problem I had a defrag would be a waste of time.
Keeping in mind that my memory is kinda foggy on this - I recall trying to fix the problem by backing up the client.dll file then copying the file from another game (ie cs 1.6/dod or something) - *note* although I remember doing this I don't have a clue whether this worked or not at the time.