Step #1: Download Primecoin Client here:
http://sourceforge.net/projects/primecoin/files/0.1.0/
Choose either Windows or Linux version and follow the easy install steps.
Step #2: In the Primecoin client, go to "Help" > "Debug window" > "Console" tab > type "setgenerate true -1" to use all of your cores or "setgenerate true 4" to use 4 cores, etc.
Snapshot of step #2 :
Step #3: Type "getmininginfo" into the debug window to see your "primespersec" (mining rate)
Snapshot of step #3:
If you found this helpful, please donate, because I still have no coins
Primecoin: AdKCSYFyp6LC88SySjmmQ3NzBSPiA8qUq4
PPCoin: PSKZWfowiCQuUCDQ5HJXt2Xyp7cJW5X2ev
Thanks