Homegroup not working after restoring a system image

[Jack_Steel 0]

After restoring a system image (created with Drive Snapshot) my Homegroup stopped working. It happened 2 times in 2 days. It doesn't work because some services failed to start (PNRP service, Peer Networking Grouping). When I try to start PNRP i get the following error in Event Log:

BODY{font:x-small 'Verdana';margin-right:1.5em} .c{cursor:hand} .b{color:red;font-family:'Courier New';font-weight:bold;text-decoration:none} .e{margin-left:1em;text-indent:-1em;margin-right:1em} .k{margin-left:1em;text-indent:-1em;margin-right:1em} .t{color:#990000} .xt{color:#990099} .ns{color:red} .dt{color:green} .m{color:blue} .tx{font-weight:bold} .db{text-indent:0px;margin-left:1em;margin-top:0px;margin-bottom:0px;padding-left:.3em;border-left:1px solid #CCCCCC;font:small Courier} .di{font:small Courier} .d{color:blue} .pi{color:blue} .cb{text-indent:0px;margin-left:1em;margin-top:0px;margin-bottom:0px;padding-left:.3em;font:small Courier;color:#888888} .ci{font:small Courier;color:#888888} PRE{margin:0px;display:inline} - <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
   - <System>
	 <Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" /> 

	<EventID  Qualifiers="49152">7023</EventID> 

	<Version>0</Version> 

	<Level>2</Level> 

	<Task>0</Task> 

	<Opcode>0</Opcode> 

	<Keywords>0x8080000000000000</Keywords> 

	<TimeCreated SystemTime="2009-11-19T23:45:03.020137100Z" /> 

	<EventRecordID>6705</EventRecordID> 

	<Correlation />  

	<Execution ProcessID="716" ThreadID="2932" />  

	<Channel>System</Channel> 

	<Computer>MUSTANG</Computer> 

	<Security />  

   </System>


  - <EventData>
	 <Data Name="param1">Peer Name Resolution Protocol</Data>  

	<Data Name="param2">%%10106</Data> 

   </EventData>


   </Event>

I found some advices to delete C:\Windows\ServiceProfiles\LocalService\AppData\Roaming\PeerNetworking\idstore.sst but it didn't help for me. Any ideas how to get this service working again?