Importing registered serves fails in MSSM 2012

I exported servers two days ago, and did a clean install of Win7, now when I try to import that sqlservers.regsrvr I face this error:

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Key not valid for use in specified state.
 (System.Security)

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Program Location:

   at System.Security.Cryptography.ProtectedData.Unprotect(Byte[] encryptedData, Byte[] optionalEntropy, DataProtectionScope scope)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServer.ProtectData(String input, Boolean encrypt)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServer.get_SecureConnectionString()
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServer.get_ConnectionString()
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServer.get_ServerName()
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServerTree.AddRegisteredServerNode(RegisteredServer regSrv, TreeNodeCollection nodes)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServerTree.DoOnRegisteredServerCreated(RegisteredServer server)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServerTree.OnRegisteredServerCreated(RegisteredServer server)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServerControl.Events_SfcObjectCreated(Object sender, SfcObjectCreatedEventArgs e)
   at Microsoft.SqlServer.Management.Sdk.Sfc.SfcApplication.SfcObjectCreatedEventHandler.Invoke(Object sender, SfcObjectCreatedEventArgs e)
   at Microsoft.SqlServer.Management.Sdk.Sfc.SfcApplicationEvents.OnObjectCreated(SfcInstance obj, SfcObjectCreatedEventArgs e)
   at Microsoft.SqlServer.Management.RegisteredServers.ServerGroup.RaiseSfcAppObjectCreatedEvent(SfcInstance obj)
   at Microsoft.SqlServer.Management.RegisteredServers.ServerGroup.Import(String file)

The operation 'Import' failed. (Microsoft.SqlServer.Management.RegisteredServers)

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For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=11.0.2100.60+((SQL11_RTM).120210-1846+)&LinkId=20476

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Program Location:

   at Microsoft.SqlServer.Management.RegisteredServers.ServerGroup.Import(String file)
   at Microsoft.SqlServer.Management.RegisteredServers.Utils.Import(ServerGroup parentGroup, String filename)
   at Microsoft.SqlServer.Management.RegisteredServers.RegisteredServersContextMenuManager.ContextImport(Object sender, EventArgs e)

All exported were remote, and I checked save username and passwords in export window.