This is what it is :
http://www.bleepingcomputer.com/star....EXE-7823.html
It's was in your restore files, it acts like a trojan as well as a worm/virus, so buy eliminating Norton's 2004 and restoring the computer you've just let it run unchecked.
In the future when your av turns up malware google it so you know what it is and what to do about it.
What you did was the equivalent of shooting the messenger.
You're now going to have to reformat.
Save what you can, and scan those files before you reinstall them on your machine, and nuke the current install.
The reason you can't get to task manager is because that thing runs at start up and prevents you from doing so. It will very likely prevent you from using or installing any av or spyware removal tools also in addition to keeping you away from on-line sites like TrendMicro's Housecall.
edit : You shouldn't have gotten tagged at all. Keep Norton's up to date.
In the future after you remove a trojan disable System Restore and reboot the computer. That will dump all the restore files and the trojan with them, also dump all temporary files with Disk Cleanup.
Re-enable System Restore after you're sure you got everything.