Hey,
Just thought I would share.
My brother runs vista and was having a problem installing the patch.
It won't install the patch, just runs through the download and then closes.
Even though his account is an admin account he had to right click on the icon and select "Run as Admin". That fixed his problem.

Got mine to start installing patch. Had to right click on icon and select run as admin... even though I am an admin user. Fucking vista. Luckily I found it on the forums... other users NOT blue of course
If anyone is having problems I hope this helps.