Additionally, before installing the patch, go to the MMC, (Right click on My Computer then click Manage) In the MMC, go down to the bottom left item and look for Services (Expand the last option and find the item there called services). Look up the service "Remote Procedure Call" Double click on this (Make sure to not open the Locator service, just the RPC) Click on the Recovery tab and then set all the event errors to "restart the service" not "Reboot the computer".
Try using the free online virus scans after this, you won't be kicked off the network anymore. Suggest Mcafee, Network Associates, Norton. Once you have run the free web scans, and get a clean bill of health from more than one, then try installing the patch.
Last step is to go to Windows Update and get all your security fixes in place.