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