help globalroot/systemroot/system32/Kbiwk..........dll

Hello

My NIS 2009 has been disabled and I get the message above.  Google does some strange things and every now and then I get a blue screen followed by a shutdown.  I have xp home edition version 2002 SP3.  Looking at the other threads I think it is a rootkit virus.  Please help in removing.

Thanks

GJP