welcome to the forum. it sounds like you been hit by a nasty malware meaby conflicker or vundo adaware.
lets see what we can do for you. i suggest you do a scan with malwarebytes anitmalware as a first step.
http://filehippo.com/download_malwarebytes_anti_malware
download install update and scan don’t forget to remove what it finds.
second do a scan with hijackthis and post the result here.
http://filehippo.com/download_hijackthis/
good luck and let us know on the progrees