You have the LoveSan or Blaster Virus. You need to enable
your firewall and change the startup options for the RPC
on recovery. The firewall is enabled in your network
connections in the control panel and the RPC can be
accessed through control panel\administrative
tools\services and then scroll down to RPC. Double click
on it to open it and then click the recovery tab. Write
down what the recovery option is presently and then in all
three drop down list choose "restart service". This will
at least allow you to remain on the internet while you go
to someplace like
www.sarc.com and use their Blaster Virus
removal tool. Once you are clean of the virus then go back
into your services\RPC and change the recovery options to
the original settings. Keep smiling.