Updating your PC should be a monthly routine for Windows users, but it can be a bit of drag.
Microsoft's Windows Update can slow a system down when it is running, meaning trying to work on anything else at the same time is difficult if not impossible.
However, Microsoft has issued an update for the Windows Update process that should change all this.
Microsoft Security Advisory 927891 is available to download now, and according to Microsoft's Christopher Budd, it "addresses an issue you may experience where systems may become unresponsive when Windows Update or Microsoft update is scanning them."
If you have configured your PC to update automatically then you need take no further action. However, if you manage your updates manually visit the Microsoft security page for further details.
http://www.microsoft.com/security/