rpc error

Windows XP is vunerable to the MBlaster virus which attacts the RPC,go the microsoft web site and download the security procedure,then check the web site of symantec or mcafee to download the virus removal tool

The above answer is correct, but to keep it from happening long enough to get the patch downloaded, you may have to enable the built-in firewall that comes with XP.

Exactly what is the wording of this error? There are many things that are affected by RPC. This service is vital. Almost everything depends on this service to be running. Make sure the service is set to auto, go to SETTINGS>ADMIN. TOOLS and click services, it is probably already running but check. This is the only service that you cannot disable via the Services MMC. It may also be virus activity and this is what you should attack first. Use a virus scanner with updated virus signatures. Then Go to: http://windowsupdate.microsoft.com
and patch your computer NOW! Look under "Critical Updates & Service Packs" Is your firewall up and running? If your computer is rebooting repeatedly, disconnect from the Internet before you enable your firewall. On the taskbar at the bottom of your screen, click Start, and then click Control Panel. Click the Network and Internet Connections category.
(If the Network and Internet Connectionsis not visible, click Switch to Category View under Control Panel on the left side of the Control Panel window.) Click Network Connections.
Right-click the Dial-up, connection that you use to connect to the Internet, and then click Properties from the context menu. On the Advanced tab, under Internet Connection Firewall, select Protect my computer or network, and then click OK.
The XP firewall is enabled.

I currently work for an security support and this issue comes up a lot recently as you can imagine. Here is a Fail proof fix and prevention process to remove and prevent it from happening again.

Perform the following steps in order to remove W32.Blaster.Worm.

http://www.emachines.com/fix.html