|It sounds like a rouge fake anti-virus tried to knobble your PC.|
** server can't find 126.96.36.199.in-addr.arpa the PC that did it isn't on-line anymore, further more that domain has been black-listed as showing up as part of the BlackEnergy network. Cybercriminals use a variety of bots to conduct DDoS attacks on Internet servers. One of the most popular tools is called Black Energy.
It sounds more like a hack attempt than a virus.
BlackEnergy is an HTTP-based botnet used primarily for DDoS attacks.
The bot has several main functions: it hides the malware code from antivirus products, infects system processes and, finally, offers flexible options for conducting a range of malicious activities on an infected computer when commands are received from the botnet command-and-control (C&C) center.
Contact Nortons Anti-Virus Research describe what happened and tell them you believe you could be infected with a BlackEnergy variant and ask them for advise.
It's hard to gauge the effectiveness of Nortons at disinfecting the threat if all you have to go on, is it's assurance that your safe! The next problem you have is you can not run two on-demand virus scanners at the same time, so you can not install another one to check if the first one is still working, the PC would crash when they both tried to run together!
Your best off trying a Free Bootable AntiVirus Rescue CD to double check your machine is disinfected.
Bootable Antivirus CD.
You'd be much better off using a different OS like BSD, OpenSolaris or Linux!
Ubuntu GNU/Linux Gets My Vote.
Whats wrong with Windows 7
Never nice hearing that your PC can be used without your consent by Cyber-Criminals who are too lame to figure out how to DoS without some lame script written by another lame idiot!
OWASP Foundation Defense Against Application L7 DoS