Sounds like the blaster worm.
To resolve this issue in Windows 2000 and XP you will need
to perform the following steps:
Change the settings for the Remote Procedure Call (RPC)
Service in order to connect to the internet without the
computer shutting down
To change these settings you will need to perform the
following:
Right-click the My Computer icon on the Windows desktop or
in the Start menu.
Select Manage. The Computer Management window will open.
In the left pane, double-click on Services and
Applications.
Select Services and a list of services should appear.
In the right pane, locate the Remote Procedure Call (RPC)
service, it will have a Status of "Started".
Note: This will be the first in a listing of two Remote
Procedure Call (RPC) services.
Right-click on the first Remote Procedure Call (RPC)
service listed.
Select Properties.
Select the Recovery tab.
Using the drop-down lists, change First failure, Second
failure, and Subsequent failures from Restart the Computer
to Take No Action.
Click on Apply and then OK.
CAUTION: Make sure that you change these settings back
after completing the final step to remove the worm.
Verify which service packs have been applied as well as
which version of Windows you are running. To do this:
Right-click My Computer on the desktop.
Select Properties. Operating system information will be
listed in the window that comes up. This will include what
version of the operating system is running as well as what
service packs have been applied to it.
The following service packs need to be applied right away:
Note: The service pack version will depend on what
operating system you have on your computer.
If you are running Windows XP version 2002, Service Pack 1
will need to be installed. If this has not been applied to
your system you can obtain it by connecting to:
http://windowsupdate.microsoft.com
If you are running Windows 2000, you must have at the
minimum, Service Pack 2 applied. Please note that
Microsoft no longer supports this version and newer
service packs such as service pack 3 and 4 are recommended
and preferred. If this has not been applied to your system
you can obtain it by connecting to:
http://windowsupdate.microsoft.com
After performing the above and verifying the required
service pack is in place the Patch can be applied.
Information and download links for your version of windows
can be found at:
http://www.microsoft.com/security/bulletins/200309_windows.
mspx
Removal of W32.Blaster.Worm
http://www.microsoft.com/security/incident/blast.mspx
Ron Kinner MVP Servers