win xp-sp2 log off regurarly (because infected with virus) can i restore xp before starting?

my winxp -sp2 infected by a virus when i try to start windows i cant . its log off before starting. i try to solve problem with working in safe mode but i cant this problem exist in safe mode. now i want to restore my windows before start but i dont know how i can do it is there any way? if you know ANOTHER solution please help me. thank you
amiriAsked:
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pratiganConnect With a Mentor Commented:
you can still boot from a Norton Antivirus CD.  It won't require a password to boot from the CD.  If you have the BIOS locked and can't even get to the boot prompt, then shut down the system.  Power it off.  Change the BIOS jumpers to remove the password.  Check the motherboard configuration from the internet.  Depending upon the make and model of the motherboard, identify the BIOS jumpers and change them to remove the password (10 seconds) then replace the jumpers and boot from the antivirus CD.  
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haim96Commented:
try to repair by booting from the xp CD then reinstall SP2.
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pratiganCommented:
even if you can restore you still run the risk of retaining the virus.
put the OS disk in the drive and do a complete reinstall of the OS.  Delete the partition and all.
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amiriAuthor Commented:
i had forgotten my setup password i cant delete my xp because i have wery important data in it . if i can restore my windows i can delete viruses .
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amiriAuthor Commented:
my pc infected by  w32.virut.w    this virus log off my xp before start.
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pratiganCommented:
Norton Antivirus 2008 you can boot right from the CD and remove the virus right from the start.  Then you will be able to get back into your system and determine the damage at that point.  At least at that point you will be able to backup your data if you have to do a fresh clean install.
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amiriAuthor Commented:
hello,friends i said that i havent set up password (phonix award bios 6.00) then i cant boot from cd
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