The stubborn virus can not be killed, how can i do?

I do not know my computer is in what virus .First, boot speed slower than before a lot , Desktop time can not adjust, moreover, After with anti-virus software, web open always for no reason flashing, then turn off automatically, I have been almosttortured mad, who can tell me how this is going, how do I have to do?

Please attach your logs. (MBAM, OTL and aswMBR…!!)
Instructions: http://forum.avast.com/index.php?topic=53253.0