From a Microsoft blog: Error 800706a6 means that the RPC binding handle is invalid.
GetUserCapability calls Windows Terminal Server (WTS) functions to query session information for the Remote Desktop Session Host (RD Session Host) server. It can be used to query session information on local and remote desktop session host servers.
If Terminal Services is not running, calls to WTS functions fail.
WTS functions on Windows XP require that Terminal Services is running. This becomes an issue when the System Center 2012 Configuration Manager Software Center is launched on a Windows XP client when Terminal Server service is not running. If the Terminal Server service is not started, the Windows API call fails.
This is not an issue with operating systems later than Windows XP Service Pack 3 as the Windows API has been changed in these newer versions.
Terminal Services must be enabled and the service started. Once that is done the Software Center will function on the Windows XP client as expected.
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