Wrt Blaster worm... it sounds like it might be the problem. This is quoted from an anonymous site:
One message you could receive with W32.Blaster.Worm is:
Windows must now restart because the remote procedure call (RPC) service terminated unexpectedly.
The computer reboots itself in 60 seconds
Another message is:
Generic Host Process for Win32 Services
Then: Remote Procedure Call (RPC) service terminated unexpectedly.
The main symptom is that your computer keeps rebooting every 60 seconds or so.
The following is our experience with this worm and there are no guarantees that this will for sure cure your computer of its worm. We are not responsible for anything that happens to your computer as a result of this information. Please be sure to read through all the following documentation before trying any of this on your computer and visit both the Microsoft site and the Symantec site for their help.
1. Kind of tricky to get rid of this worm, seeing how your computer keeps rebooting! So first of all try activating the Windows XP firewall. This may allow you to download and install the patch without your computer rebooting every 60 seconds.
If that doesn't work for you, try running this command when the shutdown notice comes up to abort the shutdown your computer is trying to do:
To enable the Internet Connection Firewall in Windows XP:
1. In the Start Menu, click on My Network Places.
2. Click on View Network Connections (on the left side).
3. Click the Internet connection that you want to protect. Then click Change settings of this connection (on the left side).
4. On the Advanced tab, under Internet Connection Firewall, select the following:
- Protect my computer and network by limiting or preventing access to this computer from the Internet. And click OK.
If you have any problems with the above, try entering the word "Firewall" in the Help Menu.
2. Secondly, there is a Microsoft Patch that you must install. The patch is located here:
(Note: If you don't have a clue which version of Windows XP you are running, download the patch for Windows XP (32 bit) and try to install it. If it is not the correct version, it will not install and tell you it is the wrong version.)
Also if you are trying to install the patch and your computer still keeps rebooting, disconnect from the internet and try again to install the patch.
3. Thirdly, Symantec has a removal tool for this worm that you can find here:
Symantec's W32.Blaster.Worm Removal Tool deletes the blaster worm files and deletes the registry values that the worm added for you. You do need to install the Microsoft Patch also. That is the most important step!
ADDED: oilman, sorry for the horizontal scroll as a result of that copy and paste.