Computer will not shut down.

I doubt if Uniblue Driver Scanner 2009 allowed you to download driver updates, unless you purchased the program first.

Your mistake was using a "driver scanner" to do it. If you want or need driver updates, you should get them from the HP software and support site for your Pavilion model number(which you didn't mention), or you should get them from the vendors' sites that create and provide them for download.

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Start your computer, go to System Restore, then select a restore date prior to when the problem occurred. See if that helps.

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If you know what particular drivers were installed then you can use the rollback feature from Device Manager to get back to the old driver. Look for a log for Uniblue.