No need to format with this trojan.
When it starts to count down,
click start/run/type system -an and hit enter.
This will stop the count down then goto microsoft.com
search for sasser removal tool.
Download it, restart pc in safe mode "F8" during startup
then run the tool in safe mode
resatart pc again
Get a FREE antivirus proggy such as AVG (
www.grisoft.com) update it and run it restart and do it again.