Hi, Yesterday night my computer got infected by some virus/trojan. I was downloading a file off megaupload and i got a popup from spybot S&D that my winint file was being modified. I disallowed it but it kept on popping up, so i selected it to remember the selection and disallowed it again. Today morning i am not able to connect to my internet and i could see the same popup from SPYBOT S&D warning about changes being made to the winint file but it was being disallowed automatically as i had earlier selected the option.It was constantly popping up and being disallowed automatically. I realised something was wrong and tried to connect to the internet but could not. Tried doing a system restore to difft dates but could not. Did a powercycle for the broadband modem but it still would not connect. Pinged the Internet Service Provider and it was successful in pinging the remote server. I uninstalled the SPYBOT S&D as it was furiously popping up the warning for the changes being made to the winint file. Then ran the AVG Antivirus saw a error " ntos.exe Reading Error". Tried to go to c:\windows\system32\ntos.exe and tried to run it but it said it was in use by another program. My AVG antivirus is uptodate and is updated automatically every morning. My windows firewall was unknowingly switched off dont know how because i remember checking on it and switching it on few days back. SPYBOT S & D is currenlty uninstalled but was uptodate till yesterday. Adaware is installed and updated till yesterday but havent yet run it. Computer is booting up but is not able to connect to the internet using a broadband connection. I understand this could be a trojan / malware issue. Please suggest a remedy.