German:
Erstelle ein backup von deinen ursprnglichen Configdateien und lsche danach den Inhalt deines 'cfg' Ordners:
C:\Programme\Steam\steamapps\xxx\counter-strike source\cstrike\cfg
Schlielich kopierst du den Ordner 'cfg' aus dem FPS INCREASE package in deinen
C:\Programme\Steam\steamapps\xxx\counter-strike source\cstrike\ Ordner.

English:
Create an backup of your originally Configfiles and then delete the content of your 'cfg' folder:
C:\Programme\Steam\steamapps\xxx\counter-strike source\cstrike\cfg
Finally you copy the 'cfg' folder of the FPS INCREASE package into your
C:\Programme\Steam\steamapps\xxx\counter-strike source\cstrike\ folder.