For all those who are having problem with punkbuster giving them high pings, please do the following
1. Go to your call of duty2 main folder, normally C:\Program Files\Activision\Call of Duty 2
2. Then into the pb folder
3. Find the file called pbns_c.dat
4. Open with notepad and delete contents and save
5. Make file read only
6. Enjoy normal pings