I have a problem with my window vista which keep on showing error every time when it try to update.
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the problem is that right now windows vista is not a reliable program and it comes with alot of glitches such as the one your experiencing. try emailing microsoft to see if they can help. www.microsoft.com

dont update it. generaly windows vista is not for updating your exciting operating system. format your previous operating system and install a new fresh copy of windows vista.

A lot of people say Windows Vista is horrible, but I have it and use my computer for everything and I personally do not have a problem with it. It's very updated and has a lot of cool features. Anyway, to answer your question, you should probably do a system restore on your computer. I am not an expert, but I do know a little something and it's apparent that something was corrupted by one way or another. This can be from a bad update or from a virus. Doing a system restore will fix any errors that may have happened recently.

Go to control panel and type in the search box in the upper right "restore" it will bring it up. Follow the directions and pick a restore point when you didn't have that problem. If you can't remember go as far as a couple weeks. You computer automatically saves restore points every few days just for you to revert back.