Hi.I'm actually using xp pro but I have the same problem too.So here's how I got rid of this problem:
Click Start > Run. (The Run dialog box appears.)
Type:
SERVICES.MSC /S
in the open line, and then click OK. (The Services window opens.)
In the right pane, locate the Remote Procedure Call (RPC) service.
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CAUTION: A service named Remote Procedure Call (RPC) Locator exists. Do not confuse the two.
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Right-click the Remote Procedure Call (RPC) service, and then click Properties.
Click the Recovery tab.
Using the drop-down lists, change First failure, Second failure, and Subsequent failures to "Restart the Service."
Click Apply, and then click OK.
p:s

o not select " Restart the service".Just select " Take no action ".Press ctrl+alt+delete and click on processes.Then find out the svchost.exe that is 19800 kb in size and does not run for either " network" or " local service" but runs for "system".That should clear up.Well,it has worked for me i don't know about others...