Firstly, please install UnHackMe and reboot your system. This will find any hidden trojans on your system and stop them.
Next you need to install MalwareBytes and run a full system scan. This application should remove any infections if finds.
Finally, to double check your system, run an online virus scan with ESET or ASquared.
Hope this help :)
Andrew at rising-uk.com
Rising PC Security @ Rising-UK.com