Boot in Safe Mode.
Switch System restore OFF.
Press Ctrl/Alt/Del simultaneously, select Taskmanager/Processes, select the process (if there), click "End Process" for:
SMSSU.EXE
Tmntsrv32.EXE
Next, run a HJT scan and place a tick-mark in the little square before (if still there):
...................................................................................................
C:\WINDOWS\System32\SMSSU.EXE
C:\WINDOWS\System32\Tmntsrv32.EXE
C:\WINDOWS\System32\Tmntsrv32.EXE
C:\WINDOWS\System32\SMSSU.EXE
C:\WINDOWS\System32\Tmntsrv32.EXE
O2 - BHO: XMLDP Class - {60371670-81B9-4d06-9C42-4DEC1AABE62B} - C:\WINDOWS\xmllib.dll
O4 - HKCU\..\Run: [SMSSU] C:\WINDOWS\System32\SMSSU.EXE
O4 - HKCU\..\Run: [Tmntsrv32] C:\WINDOWS\System32\Tmntsrv32.EXE
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Now click on the Fix Checked button in HJT.
When done, from between the dotted lines, delete the highlighted bold files.
Delete all files and directories from: C:\Documents and Settings\[username]\Local Settings\Temp
Repeat this for ALL [usernames].
Boot normal. When all OK, switch System Restore back on.