If you don’t want to see the “common groups” in the Start Menu, use this hack to disable it from getting displayed.
Navigate to:
HCU\ Software\ Microsoft\ Windows\ CurrentVersion\ Policies\ Explorer
And to:
HLM\ Software\ Microsoft\ Windows\ CurrentVersion\ Policies\ Explorer
The first value above, as you know by now, is user-specific, and the second is the system-wide setting.
Change the DWORD Value of NoCommonGroups to 0 to disable the display, and to 1 to re-enable it.
