This is in reply to your l4d pink and black squares thread. First you need to google a program called gcfscape. If you have backed up your pak01dir (by changing the name) you need to change it back. This file needs to be in its original state with the original name. Run GCFScape. Locate pak01dir and extract every folder you can from it and install those folders in your l4d directory. Now change the name of the original pack file and go back to using your customized version. This may or may not overwrite your custom skins but will solve the problem.