What is wrong with my computer?

[chandra]

Try this .
Download malware bytes from this link and scan your computer . After quick scanning, if there are any malware, it will show you in the scan and ask you to click "show results". Please select all those and remove it using this tool.
Then reboot and scan full scan, and delete the malwares. These malwares come with bundled program with the downloads from suspicious sites.
Download only from secured sites like majorgeek.com filehippo.com , the required downloads,else choose the author sites
If these do not fix, system restore is the only other option to get rid of these popups.download the free version.
http://www.malwarebytes.org/