Install BootCamp update 4.0 on Windows 7 x64 returns error

Hello,

I have a problem updating BootCamp software on Windows. Updating from 3.2 to 3.3 or 4.0, from ASU or from manual installation, returns this:

https:// picasaweb.google.com/lh/photo/-w77Vf1cQrlarNb_LUz7fNct5nxxnOU3qWXwGpPvXwI?feat=directlink (spanish)

Basically, it says that I'm using a network resource that is not available, and tell me to pick a "BootCamp64.msi" file

If I set the file, it returns this:

https://picasaweb.google.com/lh/photo/_tqfhSNKK1wBmojjR7kWy9ct5nxxnOU3qWXwGpPvXwI?feat=directlink (spanish)

It says the file set is not valid msi for installing Boot Camp Services, and tell me to find a file called "BootCamp64.msi" on a folder ready to install Boot Camp Services

This for 3.3 and 4.0 versions.

In the log, it says...:

Info: Found Boot Camp x64 version 3.2

Info: BootCampUI failed to install 64 bit Boot Camp patch. The install returned 1603

Info: BootCampUI is exiting. The install returned 1

I know how to manually install the drivers, but what I want is update bootcamp.

Details:

SO W: Windows 7 x64 Updated

SO OSX: Mac OSX 10.7.3 "Lion" Updated

Mac: iMac 21.5" (Late 2010 I think) 500GB, 8GB RAM.

This problem appeared from the first day I installed Windows 7.

I also have a log file from de msi generated with the command "/l*v c:\log.txt",it doesn't make me happy to make it public, but I've attached.

Thanks,

Alberto Salazar

P.S. : I'm spanish, so my english might be difficult to understant. Sorry.