If you are unsure of the process, I am including a link that has a video showing how to do it: <a href="http://helpdesk.malwarebytes.org/ent...rom-quarantine">http://helpdesk.malwarebytes.org/ent...rom-quarantine</a> Then reboot the machine and hopefully this will improve the performance although there are still some issues with malware that can have some effect.