I hate too say this but, run a full virus scan with Advanced System Care 8.0 which you can download from kickass.to, it's a free program you can download and use too scan your pc daily, try too make your system completely clean again or run a system recovery back to the time your pc was clean / or might have too try a factory reset so the virus/malware will be deleted.
Also when you will redownload and install the client, turn off the Antivirus before you download it, BUT put everything in exception list!
But you really should make your PC totally clean again...