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How to get reath of pirate viruse.When i instal antiviruse it erases wole my computer

yeah, many viruses block the installation of antivirus programs...
you can try different antivirus programs, Norton for example has the option to check for viruses before installing, the virus signatures are not the newest then but it´s worth a try. another option is to connect the HDD to another system and scan it then.
if you need to access/save important data on the HDD use a Linux live distro like Knoppix and boot from CD or USB-stick, you´ll be able to access the files then....


p.s. please use a more meaningful topic name next time...

You could try an online antivirus scanner


this might help
http://housecall.trendmicro.com/

you can use a free virus scanner like spybot, but it might not be as efficent. if you know the name of the virus you can google search it and come up with specific virus killers that can help more than over all search one. where does it hide? you can get registry scanners for those that hide in your registry and ect.

Spybot is a virus scanner? I thought it was just a adware/spyware/malware scanner.

well, it picks up some trojans and viruses too, but it´s no replacement for a real virus scanner....