Sounds familiar; 1) Did you by any chance install Microsoft AntiSpyware Beta? I did. And after about 24 hours it made my computer to crawl. Had to restart and everything was ok for a while, and again crawling.... And crashed my Office XP Pro!!!! Couldn't open any office files before I restarted my computer. Naturally uninstalled, and ever since everything has been ok. 2) I think (not sure about this!!!!!), that Symantec (Norton) had some kind of malfunctioning installer on their update; ( this was before that AntiSpyware incident) I have Norton Internet Security 2005 and SystemWorks 2005 premier installed (have had Norton since 1998 I think), and got the usual updates. After the updates Norton AntiVirus was working ok, Norton SystemWorks 2005 Premier was ok, but the firewall was real slow when opening it and I couldn't change my firewall settings. And my computer was overall acting real slow. Couldn't find the solution. Uninstalled all Symantec products, reinstalled them all, and everything was working great/ as supposed to. This might be an issue concerning only my computer, but after reinstalling all the Symantec products, I got an update which seemed to me to be a batch file. I do not know, and most definately, I do not understand what happened, but it solved my problems.