i used to have xp sp3 but had to reinstall windows due to a virus or some other malware.it just kept shutting down every program i would try to open and then deny me access to whatever it was i was trying to do,and say , the program might be infected with a virus. before i knew what happened i could not get online or open any apps.sooo.....i reinstalled windows and was taken back to sp.1 thars when things gotbad. i was able to put my dial up connection back together and get online but couldn't get access to windows up date or microwsoft update. so i upgraded to ie8{i had ie 5 after the re install} some how it got me to update and i was able to update to sp 2 .now when i try sp3 it won't evenstart to download . the bar just sits at 0% .i have since uninstalled stopzilla because someone told me it could be messing up the download. so i really need to get security essentials. also i tryed to download one care scanner and i got through the part that has you defrag your system and did.but when i tryed to use the protection scan it would only go 50% done and thats were i got the error code.1 person needs an answerI do too