Vista - Microsoft Virtual PC 2007 won't install

Hello,
First of all, great forum! :P

As you can see from my profile I have Vista Ultimate x64 but I can't install Virtual PC 2007. Basically I downloaded the installer (making sure it was the x64 version), ran it and it all went fine until suddenly the installation just rolled back and said that no modifications were made to the system. It doesn't give me an error message.

I searched on the Internet but I can't seem to find the solution. And yes, I tried both the normal installer and the SP1 version.

Any tips?

EDIT: I now found out that it rollsback when it says "Installing network drivers (x64)...".

Hello Rhystic1, and welcome to Vista Forums.

See if right clicking on the installation file and clicking on "Run as administrator" will allow it to install.

Hope this helps,
Shawn

Thanks for the reply,
I already tried that but it fails to install as before.

I found a workaround. I got a newly installed OS with full network support up and running in Virtual PC 2007 SP1 now.

Quote that I put on a blog:

I had the same problems but I have my UAC disabled so I can not solve it by running it as an administrator, as I am the administrator (vista 64bit).

I did/do however get the 1603 error all the time trying to install.

By reading throught the log (which is dumped into your default TEMP folder. you can find it by checking your enviroment variables i CMD typing SET TEMP) seeing most or all of the stuff got installed, THEN ROLLED BACK, I "solved" it by disabling Windows Installers rollback rights. Meaning all the stuff gets installed, the installer fails to rollback. And I can run virtual PC finally

1. run: mmc-> add Group Policies. Local Computer Policy\Computer Configuration\Administrative Templates\Windows Components\Windows Installer\Prohibit rollback -> ENABLED.

2. Install

3. Turn off the policy again (no reboots are required. windows installer sees the policy right away)

Sorry to bump but can you elaborate on the fix a little bit - I have the finnish version of Vista and I'm completely oblivious what I'm supposed to do with mmc D:

I might've written it to advanced, but here is the easy version (you will have to translate to your finnish version yourself):
start MMC (windows-key + R), write mmc <ENTER>

Once mmc is up, open File->Add/Remove snap-in...
Choose the snap-in: "Group Policy Object" (looks like an open scroll). Doubleclick it so it goes into the list on the right. In the popup just press "Finish".
Then press "OK" to get all the way back out to the MMC.

Here is how it looks like when I have denied rollback for windows installer.

But the problem, as I see it, is that this should to be happening in the first place. I used Virtual PC 2007 on both Vista Ultimate 32bit and Vista Ultimate x64 without a hitch and without install problems to begin with....

The rollback should be happening. But noone has been able to solve this puzzle with people not being able to install VS 2007 (SP1) on x64 Vista machines yet.

And this "hack" solves it, and it works.

So untill someone tells me how to fix it, this is the solution for anyone who wants to get it installed.

The problem has been out for a long time.

I believe this section of the install log is the key to the rollback occuring. Maybe someone can figure this one out: