No issues here either. what method are you using to check?
Still does not work, I have hl2 open. Using this "GetModuleHandle("client.dll")" it still returns nothing, does it have to be capitalized or aomething? I, however can get the address of kernel32.dll.
Are you working internally or externally? If external, you can't use GetModuleHandle, because it just for dll's loaded in your process.