Why is there ads and pop up appearing everywhere?

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Ads and pop ups are a clear indication of your system being infected with malware.
Download Superantispyware and AVST. Install and run both. Remove and found threats. Restart computer.

Download AVAST from
http://download.cnet.com/Avast-Free-Anti...ag=mncol;1
On the lest side, click DOWNLOAD NOW. Install, run it-remove found threats.

Download Superantispyware from
http://download.cnet.com/SuperAntiSpywar...ag=mncol;2
Download it,install it, run it. Perform Quick Scan. Once scan is complete, click Show results-check all threats found and click Remove Threats.
(As a small PS- i choose Superantispyware over MBAM(Malwarebytes), simply because MBAM is not what it used to be, and Superantispyware actually cleans up where MBAM failed)

Download Cleaner from
http://download.cnet.com/CCleaner/3000-1...ag=mncol;1
Cleaner is a very useful tool that cleans your computer of temp files, history and cookies. Its also used to fix any registry errors.