Brazilian Variant Virus?

Two brazilian internet banks Banco do Brazil and Caixa Economica Federal ask in their website for the user to install a security plugin called GBPLUGIN. I think a variant virus has emerged from that. The computer gets really slow and the file is not possible to be deleted, uninstalled not even with unlocker program. I tried the unlocker program but when I tried to delete it the computer reboot. I tried bitdefender but it's been 3 days now and bitdefender cannot finish the scan since it's reaaaaaaaaaaaaaaly slow. Same thing happened when i tried kaspersky except kaspersky detected gbplugin as an invader but won't let me delete it. I'm now using bitdefender rescue cd to see if I get some luck. I'm close to format my computer...