Louis,
First, do not reboot -- that seems to be what activates the virus. Try searching your PC for the following files:
Kernel32.exe
KDLL.DLL
If you find them, you are probably infected. I can't give you detailed instruction of how to proceed, if you are, since we use different anti-virus programs. Go to the Norton Web site & see if you can find information there that will help you eliminate the virus.
If you don't find the files, you may have dodged a bullet -- your AV program may have caught them. Download and install the latest AV update. Good luck! Let us know how you make out.
What makes this virus so insidious is that it actually appears to be a reply to one of your own e-mails, rather than simply an unsolicited e-mail from someone you know. Fhuckers!