You probably have a virus that redirects you to a add, Addware
It doens't happen with me.
Get malwarebits or something to delete spywares and crap!
First, download Malware Bytes(MBAM), if you want a serial key PM me, and now install MBAM and restart your computer and boot up in safe mode, then run a scan with MBAM and remove all infections, then restart and boot normally, and now everything should be gone, if your homepage is still the ad-war site, you might need to go to Internet Options ot Tools, and change it back.
If problems still persist let me know.
Scan with your AV, with MBAM and run TFC by oldtimer.