Just follow the directions on this link. It works fine for me. You can actually just drag the installer into the cmd prompt and it will auto fill for you then just type " /force" after it. there is a space between the .exe and the backslash.
I think this is as good of a fix as we're going to get. In their defense though all you have to do is type a line on the cmd prompt and it works fine. I never had a problem while it was installed on 64-bit vista and still haven't had any troubles with it in windows 7
I was getting security id errors and couldn't do any updates -- I reinstalled Google Desktop (including downloading the latest) on top of my old broken one, and all is now well.
My Computer
Computer Manufacturer/Model Number
Custom
OS
Windows 7 RC build 7100
CPU
Intel Core Duo E8400 @ 3.00GHz
Motherboard
MSI MS-7514
Memory
4 gig
Graphics Card(s)
ATI Radeon HD 3600
Sound Card
Built in
Monitor(s) Displays
Samsung 19" Dual LCD
Hard Drives
2 x 500 gig
2 x 250 gig
2 x 1TB (removable), can mount only 1 at a time