BIOS Upgrade Begets DRM Problems With WMP11

I recently updated BIOS on a Compaq Presario 5330US running XP Home SP2. Now when I play DRM protected content with WMP 11, I get a message that states "Windows Media Player cannot play the protected content file because a security upgrade is required. Do you want to download the security upgrade?" I click on "YES," and get another pop-up message. This message says "The file or device that you are trying to use requires a component of Windows Media Player to be upgraded; click Upgrade to download and install the required component." I do, but nothing happens.

I went to the Microsoft site and read a document at http://msdn2.microsoft.com/en-us/library/aa387015.aspx, which seems to describe the situation. It appears that my WMP 11 is not "Individualized" through Microsoft's Individualization Service.

I found another document at http://support.microsoft.com/kb/925705/en-us, which sends you to a Microsoft web site at http://drmlicense.one.microsoft.com/Indivsite/en/indivit.asp titled Security Component Upgrade. There is an "Update" button there, but it is grayed out and not selectable.
Ive tried rolling back to WMP10 and reinstalling WMP11 (twice), I even reinstalled Explorer 7, but neither action corrected the problem.

Non-DRM protected content appears to run unaffected on WMP 11, and everything else seems to work OK, but I am very frustrated that megabytes worth of previously downloaded content is not available to me, nor am I able to run new content from the same sites. Also, I have another HP computer that has a BIOS upgrade available, but I am understandably worried about attempting this.