here is my little malware removal guide
these days what is much more common are PUPs..potentially unwanted programs that gives adware that came in a bundle with something else.. .
run adwcleaner and junkware removal tool .. you can get them here
http://www.bleepingcomputer.com/download/windows/security-utilities/
and then do additional cleanup with MBAM
https://www.malwarebytes.org
then go check your browsers for any "bad" extensions.. remove if possible.. if none are seen, and you still have adware in your browsers, then you'll need to reset your browsers.. (google on how to reset them)..and also set homepage and search engine defaults
for virus / trojan detection that you can use in conjunction with any real time AV you have. these scan tools don't offer real time protection but are good removal tools
online scanner from eset
http://www.eset.com/us/online-scanner
and / or kaspersky's avptool
http://www.kaspersky.com/antivirus-removal-tool?form=1
after it's cleaned out... install (into firefox) a popup blocker adblock plus, adblock edge and another addon called noscript. also while at
malwarebytes, look at it's free anti-exploit as another form of protection
check out Baidu http://antivirus.baidu.com/en/
top rated.... extremely fast install and scans... very low on cpu usage
http://www.marketwired.com/press-release/baidu-antivirus-ranks-first-place-av-comparatives-performance-test-receives-advanced-nasdaq-bidu-1921386.htm
test results http://antivirus.baidu.com/news/2014-06-16/1409402461.html