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Q How can I keep a backup copy of Microsoft updates I've downloaded so I won't have to get new copies of them if I have to reinstall my software?
ANot only would such an archive of Microsoft patches speed any reinstallation, but it would also let you update the computers of friends with slow Internet connections by bringing over the files on a disk.
But for most home users, there is no easy way to create such a thing. Microsoft doesn't offer a simple list of its patches on its Web site, and its automatic Windows Update system hides these downloads behind cryptic names in system directories. Special programs can "slipstream" Microsoft's fixes onto a copy of a Windows CD or DVD, but most home computers don't include a Windows disc.
You can, however, collect the comprehensive Service Pack updates Microsoft releases every few years. Service Pack 1 for Windows Vista shipped in March, while Windows XP's Service Pack 3 arrived last week. You can find both at http:/
After a lengthy download -- Vista SP1 weighs in at 435 megabytes and XP SP3 at 316 megs -- you'll have a single installer that applies every system patch issued since the release of each version of Windows.
But the sweeping scope of a Service Pack involves some risk. If your copy of Windows isn't working right before you add one, the installation can fail catastrophically.
Vista SP1 and XP SP 3 have worked fine in my tests, but you shouldn't rush to install either. Run a complete virus and spyware scan first, then cross your fingers while the installation grinds away.
Rob Pegoraro attempts to untangle computing conundrums and errant electronics each week. Send questions to The Washington Post, 1150 15th St. NW, Washington, D.C. 20071 orrobp@washpost.com. Turn to Thursday's Business section or visithttp:/


