Windows7/Mozilla Firefox/ Pop- up windows and underlined words

Hello to everyone! :-)

My name is Manolis and I come from Athens, Greece. Firstly, I would like to mention that I don't know much about computers so whoever is kind enough to answer this thread, please keep it simple. Thanks! :-)

I have Windows7, I run Mozilla Firefox and I use Avira Free Antivirus.

During the last few months when I was browsing different pages I saw that some words were underlined. When I rolled over the underlining I realized it was an advertisment saying "Click to continue -> By CouponDropDown". It usually advertised Ipads or some kind of online casino games. I didn't pay attention but it started getting worse. More and more words were underlined in this way. As if this were not enough, pop up windows started to appear saying that it was some kind of survey on behalf of Mozilla.

I realized it was probably a virus so I visited the Mozilla Firefox support page where they advised me to download the following malware scanning programmes: Malware Bytes AntiMalware Free, Superantispyware Portable Scanner, Microsoft Safety Scanner, Anti-Rootkit Utility TDSS killer, and ADW cleaner. I ran all of these programmes and many viruses were found and removed. The problem diminished temporarily but then I started seeing again underlined words and pop up Windows.

Is there anything else I could do?

Thank you in advance!

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