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upgrade to 4.o failed and cannot uninstall,get msg about a previous upgrade must be completed

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Tried to upgrade to 4 from 3.6.after restart FF would not work.Tried to uninstall and get 3.6 back.Now I get a msg "ur comp must be restarted to complete a previous upgrade of FF.Do you want to reboot now.This help site said for this problem (for Win 7 OS) go to %APPDATA% and delete file xpicleanup.dat,which u will finsd in APP Data folder,Local\virtual store\Prog files\Moz Firefox.I cannot find any such file xpicleanup.dat.So I need help to get ris of FF 4 and go back to 3.6? Can someone help PLEASE ?! THANK YOU

Tried to upgrade to 4 from 3.6.after restart FF would not work.Tried to uninstall and get 3.6 back.Now I get a msg "ur comp must be restarted to complete a previous upgrade of FF.Do you want to reboot now.This help site said for this problem (for Win 7 OS) go to %APPDATA% and delete file xpicleanup.dat,which u will finsd in APP Data folder,Local\virtual store\Prog files\Moz Firefox.I cannot find any such file xpicleanup.dat.So I need help to get ris of FF 4 and go back to 3.6? Can someone help PLEASE ?! THANK YOU