Steam will no longer support Windows XP SP1 as of August 31
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Valve has announced it will no longer support or build updates for Windows XP Service Pack 1 on Steam from August 31. Those with Service Pack 2 and above will not be affected. Valve said in preparation for this, users may wish to bite the bullet and upgrade to SP2. While there's probably very few out there who have yet to upgrade at this point, there are likely a few closet users still out there, so it's worth noting. Thanks, CVG.