Personal Anti-virus program invasion malware

My machine has been infected with some sort of virus under the guise of Personal Anti-virus. This virus pops up as a virus scan window the moment we logon. When we have been logged on for a few minutes music starts playing like a radio station and we have to shut down and start over cause it locks up the computer. Please help us rid ourselves of this virus, other wise we will need to get a new pc. One more thing this virus has eaten 2 store bought anti-virus scans, it just locks them up and will not allow them to run. Without help we can only be on our pc short periods of time each time we log on.

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