As soon as I open WMP 11 I get "WMP encountered an error and needed to close. Sorry for your inconvenience." When I try to install music match 8, the files extract. But, when it goes to install them; I get "failed to launch setup. the remote procedure call failed." I think I may have deleted a needed file with an aggressive registry cleaner; although, I dont get any dll errors.Any Ideas? I have tried reinstalling SP3, but still have the same problem. I am running win XP home SP3. Other programs in stall fine.

Check that service is in Automatic and started

Start->Run-> services.msc

Scroll down to Remote Procedure Call
Double click on it
Change the startup to automatic, apply
Click on Start to Start it
Restart

Any further issues, have a look at:
UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions

IF the above doesn't fix the try, go into Services again and enable both Universal Plug and Play (uPnP) and SSDP i believe are also both needed and might have been set to disalbed by something/someone in the past.