Ok, I've seen this some times before. This is the first approach to the problem, that did work the two times I got this error. Below this solution I've put something from Microsoft's site. You can try both together also to see if it works, I'm not sure.
------------------ Suggested Solution -------------------> Open Notepad and type this in:
CODE
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs]
"Description"="Provides the endpoint mapper and other miscellaneous RPC services."
"DisplayName"="Remote Procedure Call (RPC)"
"ErrorControl"=dword:00000001
"Group"="COM Infrastructure"
"ImagePath"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
00,76,00,63,00,68,00,6f,00,73,00,74,00,20,00,2d,00,6b,00,20,00,72,00,70,00,\
63,00,73,00,73,00,00,00
"ObjectName"="LocalSystem"
"Start"=dword:00000002
"Type"=dword:00000020
"FailureActions"=hex:00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,00,00,00,\
00,02,00,00,00,60,ea,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs\Parameters]
"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
72,00,70,00,63,00,73,00,73,00,2e,00,64,00,6c,00,6c,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs\Security]
"Security"=hex:01,00,14,80,a8,00,00,00,b4,00,00,00,14,00,00,00,30,00,00,00,02,\
00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
00,00,02,00,78,00,05,00,00,00,00,00,14,00,8d,00,02,00,01,01,00,00,00,00,00,\
05,0b,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\
20,02,00,00,00,00,18,00,8d,00,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,\
02,00,00,00,00,14,00,9d,00,00,00,01,01,00,00,00,00,00,05,04,00,00,00,00,00,\
18,00,9d,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,21,02,00,00,01,01,00,\
00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs\Enum]
"0"="Root\\LEGACY_RPCSS\\0000"
"Count"=dword:00000001
"NextInstance"=dword:00000001
-> Save it as some .reg file (example: mod.reg)
->Backup your registry*. In case you don't know how:
-----> Click "Start", then "Run..."
-----> Type in "Regedit"
-----> Click "File", then "Export..."
-----> Check export range to "All" (bottom of the window)
-----> Save as something like "Backup.reg"
-> Run the .reg file you saved from Notepad.
-> Restart your computer.
*To backup the registry just run the .reg file you exported from Regedit.
------------------ Microsoft's Solution ------------------This is Microsoft's approach, in case the above one didn't work:
1. Click Start, and then click Help and Support.
2. Under Pick a Task, click Use Tools to view your computer information and diagnose problems.
3. In the Tools area, click System Configuration Utility.
4. In the right pane, click Open System Configuration Utility. This opens the System Configuration Utility.
5. Click the Services tab.
6. Make sure all the following services are turned on. To turn on a service, click to select the check box.
• Application Layer Gateway Service
• Network Connections
• Network Location Awareness (NLA)
• Plug and Play
• Remote Access Auto Connection Manager
• Remote Access Connection Manager
• Remote Procedure Call (RPC)
• Telephony
7. Click OK, and then click Restart.
------------------ End of Solutions ------------------I hope this helps you, seriously. As I said already, the first one did work for me, but you can try the second one at will.
Comment/Reply (w/o sign-up)
it's quite important to have this service running, a lot of other services depend on it, for example the firewall.. :s and the internet connection... 
