welcome to the forum.

i suggest you download install and scan with malwarebytes antimalware as a first opion.

http://filehippo.com/download_malwarebytes_anti_malware/ don’t forget to update.

then i suggest you do a scan with hijack this and post the result here.

http://filehippo.com/download_hijackthis/

good luck and let us know one the progress.