Thank you for informing us this issue. Virus infection is a serious matter and we would like to help you ASAP. As you're a valued subscriber of our premium support service, we would like to directly pass your issue and question to our premium support center. Someone from the premium support service center will contact you soon to help answer your questions and resolve infection issues.
Regarding your question on changing password -- you can change your passwords to avoid other potential risks, though it won't be enough to clean up your PC.