Urgent Problem Please Help (RESOLVED)

[Robbo]

OK i have WINDOWS XP SP2 installed, i recently put on the new adware thing from microsoft to get rid of spyware, however since it changed a few things in the registry the firewall serivce wont star, ive tried uninstalling the SP2 and re-installing SP2 but that didnt work, machine works fine and is fully updated connected and getting update automatically and has no more, if i go on control panel and double click the windows firewall it just state it cannot open for an unspecified reason, i think the firewall part may need re-installing, but how can i do this, please help, the rest of the PC works fine??

oh and i havent got a restore point, but worked fine before the spy ware thing

PLEASE HELP, THANKS IN ADVANCE