Registry Edit:
[HKEY_CURRENT_USER\software\microsoft\windows\currentversion\policies\explorer\disallowrun]
"1" = avant.exe
"2" = firefox.exe
"3" = msmsgs.exe
"4" = msnmsg.exe
"5" = msnmsgr.exe
"6" = netscape.exe
"7" = opera.exe
"8" = opra.exe
"9" = skype.exe
"10" = skypepm.exe
"11" = skypesetup.exe
I got this via combofix application downloaded from combofix.org run on Kathy Goshert’s laptop.
Haven’t verified how this key affects browser running or not.