I hope someone can help with this major problem i seem to be having........ ive spent hours searching and trying to fix but nothing

Ok the problem started today, everythings been fine since today......... what happens is.....
When i log on Windows XP.. i get a messege Winlogon.exe memory error but it doesnt come everyreboot just some..... but within 10 mins all i get is Norton Comming up with its email scanner with what looks like my pc seems to be sending 100's of spam emails, all about sex/adult ????????? i have run Norton Anti in Full Scans and found nothing
, i have also tryed it in Safe mode still nothing..........Plz help its driving me insane as i use the pc for work and at the moment its unusable

Thx in advance for any info or help.......






























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