"Windows could not load the installer for MEDIA" error with 837119 KB hotfix

Hello,

I have recently downloaded the "COM+ Rollup QXP6 for Microsoft
Windows XP" hotfix from http://support.microsoft.com/?id=837119 and
tried to install it on my Windows XP Pro machine. During the
installation a progress bar shows but freezes at 0% and the following
error message pops up on my screen: "Windows could not load the
installer for MEDIA. Contact your hardware vendor for assistance.". I
haven't tried installing other hotfixes from Microsoft so I don't know
wether the problem comes from this particular patch, but I suspect
that the same would happen with other updates as well.

I also tried deleting the %System32%\CatRoot2 folder because I
read in a post that this could solve the problem. Well, it just made
the progress bar move to 2% and the error message appeared again.
Every time I start the installer the %System32%\CatRoot2 folder is
recreated.

It is really vital for me in this moment to install the patch, so
I would greatly appreciate your help.