Remote Desktop (mstsc.exe) Won’t Launch in Windows Vista SP2: Fix
Several users have reported that the Remote Desktop Client (RDC, mstc.exe) will not launch after the update to Windows Vista SP2. In some cases, mstc.exe will appear in the task manager, but the application will not appear in the task bar or be otherwise accessible.
Potential fix
This issue can sometimes be resolved by running mstc.exe from [...]

