Thats an obvious sign of adware. Adware stands for ADvertising supported softWARE and its responsible for annoying pop-up and website redirection to suspicious / dangerous / porn websites.
Tools that will remove it :
♣ Malwarebytes AntiMalware
♣ SUPERAntiSpyware
♣ Spyware Terminator
♣ Ad-Aware SE
♣ Spybot Search & Destroy
♣ HijackThis
I`d give special intention to the first 3 programs listed.
How to set/configure SUPERAntiSpyware : http://www.ecuhq.com/tested-programs-how-to-use-f32/superantispyware-how-to-use-t121.htm
HijackThis removes malicious registry keys, pretty useful for final cleaning.
How to use HijackThis : http://www.ecuhq.com/tested-programs-how-to-use-f32/hijackthis-how-to-use-t67.htm
All available at :
http://www.filehippo.com
http://www.download.com
http://www.softpedia.com
http://sourceforge.net/
You could also try going back in time, using System Restore : http://www.ecuhq.com/tricks-f6/create-a-system-restore-point-checkpoint-t28.htm
Hope it helped.
If interested in computer security, feel free to visit : http://www.ecuhq.com
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