Is there a way to prevent spy sware to get on a PC, My friend's PC is getting a lot of them. I clean them up with Ad-aware and Spybot, as an experiment, I went on a few site, then I scan the PC with Ad-ware and spybot again, the spy ware came back. I did this a few time and the same thing happened. Among the spy ware are these 2o7, admit.... What can I do to complete bar them from the PC? Is there a LIST available to find out where they come from?

MacPCFirst, I would disconnect that computer from the Internet, and then RUN Ad-aware and Spybot, RESTART the computer (still not connected to the Internet) and scan again.  Does some of that spyware re-appear?  If so, then more stringent measures will be necessary to clean it up.

Is a fireware enabled on that computer?  Firewall protection is absolutely essential for being online and not getting quickly infested with spyware.  Repeat, you should never GO online without firewall protection.  

Since Spybot is installed, I would use the Immunize feature of Spybot.  It's quite helpful in preventing certain spyware from getting into a computer.

To get info on specific spyware, use Google.  Also, when you do your scans do them is Safe Mode with System Restore turned off to prevent reinfection.  What I do is the following....

When I do not feel like purchasing anti-spyware softwares (or obtaining it through "other matters") I use their trial versions to my advantage.

To save some work run free anti-spyware's to get rid of most of the spyware. Then download a trial of Spyware Doctor or any other fully PRICED anti-spyware. They graciously tell you the registry keys of where the infected spywhere is. Then you just remove everything manually.

Also, zonealarm firewall is very effective with prompting the user of any sort of programs that demand internet access.

Best of luck.