1. Microsoft Fix it 50195 to reset IE settings. Even if you are not using IE as default browser, you might want to reset it.
2. Microsoft Fix it 50267 to reset the hosts file in Windows
3. TDSSKiller from Kaspersky: http://support.kaspersky.com/viruses/solutions?qid=208280684
4. Hitman Pro: http://download.cnet.com/Hitman-Pro-3-32-bit/3000-2239_4-10895604.html
#4 and #5 will scan for trojan/rootkit infection that is known to cause redirection while browsing.
( I use Microsoft Security Essentials and Malwarebytes Anti malware, along with FireFox)
recently i was attacked by a virus and after scanning with the above two programs all the virus's detected were removed. However after words i got a proxy error whenever i tried to connect via FireFox, i fixed this by making FireFox automatically detect proxy settings from my Internet.
However, sometimes when a page is loading ( even secure websites like wiki and news websites ) i will be redirected to an ad site or hardcore pornography dating sites.Sometimes FireFox automatically blocks the sites after displaying the "attacked / virus site gate. Also sometimes sites will take a stupidly long time to load like a basic google search when other computers on the router take an instant ( this only happened after the attack ) I have cleared my cache ETC and still it continues and is a massive problem, i fear a more sinister virus is up to work here and is evading detection. I can barely use the Internet at times because its so bad, thank you so much.