well to be honest, it sounds like you just have a bad install. What I would do is:
1) Delete all folders/contents from the previous goldeneye source install that you did.
2) Redownload the GE:S Beta 3.1.4 (Full) again from a DIFFERENT source this time. There has been know to have a few bad install locations around.
3) Do not download the patch like you did before, if you download the full 3.1.4, you will not need anything else.
4) Close Steam BEFORE installing anything new
5) Run the install and make sure it is mapping to a valid steam folder aka make sure it doesn't do "C:\program files\VALVE\Steam\Steamapps\Sourcemods" when it really should be "C:\Program Files\Steam\Steamapps\Sourcemods". Just check those directories out.
6) Finish installing it, restart steam, try it again.