If you are getting strange popups then you have a adware infection
To remove adware and other malware
Download, update and run
The free versions can detect and remove
Malwarebytes AntiMalware
http://www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
and
SuperAntiSpyware
http://www.superantispyware.com/
Scan in Safe Mode(press f8 rapidly while booting and select safe mode)
To remove adware and other malware
Download, update and run
The free versions can detect and remove
Malwarebytes AntiMalware
http://www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
and
SuperAntiSpyware
http://www.superantispyware.com/
Scan in Safe Mode(press f8 rapidly while booting and select safe mode)