CoD4 Punkbuster error

every single time I try to join a punkbuster server I get to play for like 10-20 seconds then I get this:



I'm not using a legit version of CoD4 but I'm not sure if that's the problem or not, do any of you know non-punkbuster promod servers or know of a fix to this problem? Thanks in advance

These kicks are when PunkBuster detects a modification of your game exe running in memory or you are using a modified client. Possible explanations are as follows:

1. A virus modified the game executable
2. A crack of some sort was applied to the game executable
3. You are using a non-standard version of the game (D2D/Steam etc.)

Please make sure you run the latest and original version of the game. Using no-cd cheats could be the cause of these kicks. Make sure you have installed the latest patches of your game.