How can i remove a virus if my anti-virus doesnt dectect it?

-i have a virus in my computer but my anti virus doesnt detect it. I have avg antivirus and when i run a scan i says that im protect it that no virus or anything was found but i know ihave a virus because my computer all of a seten got slow and when i try browsing on the it sends me to another page let say i try going to youtube and unstead of sending me to youtube page it sends me to a porn site or a site that says that i won something everytime i try going to a site it sends me to another one. Can anyone tell me what can i do about does anyone how can i remove it? Can somebody help me i'd really appreciate ur help. try going to youtube and unstead of sending me to youtube page it sends me to a porn site or a site that says that i won something everytime i try going to a site it sends me to another one. Can anyone tell me what can i do about does anyone how can i remove it? Can somebody help me i'd really appreciate ur help.as soon as I read the first line of the question I knew you were using AVG it really has gone downhill recently, do what the other guys say , get malwarebytes, combofix (or sophos or greatis) and go to www.bleepingcomputer.com for instructions, you have a rootkit virus, then get avira, avast or comodo as your antivirus
try downloading a different anti-virus program such as



malwarebytes

http://www.bleepingcomputer.com/download鈥?/a>



spybot search and destroy

http://www.safer-networking.org/en/downl鈥?/a>



superfreeantispyware

http://www.superantispyware.com/



Avair

http://www.avira.com/en/for-home



These all have free version which have very good virus detections so you don't need to buy the full product unless you want all their other services
Ok if u know how to back up to ur computer, go back to the last date u did, and restore it from then. Don't download anything u did that u could get the virus from.
Use malwarebytes antimalware and avast antivirus. There is a site http://bleepingcomputers.com that can tell you more.
Google redirect virus......removal instructions...........



http://www.bleepingcomputer.com/virus-re鈥?/a>