I've tried installing your product onto my Vista laptop using the Windows Web Platform but when I try to open the start page I get the error...

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HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information
Module IIS Web Core
Notification Unknown
Handler Not yet determined
Error Code 0x80070003
Config Error Cannot read configuration file
Config File \\?\C:\Users\Ian\AppData\Local\silverstripe\web.config
Requested URL http://localhost:80/test01/index.php
Physical Path
Logon Method Not yet determined
Logon User Not yet determined

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Also when I run the install process its not clear what folder should be chosen for the physical location.

That sort of reply doesn't help anybody.

The vendor advertises an install using a Windows web based install, I try to use it, it fails, I place a support question. Fairly straightforward really.

As I've not had the courtesy of a meaningful answer I've dropped my plan to evaluate this product and will look at 'CMS Made Easy' instead.

Not too familiar with the "Web Platform", but if it uses IIS, make sure the IUSR_machinename account has read/write access to your Silverstripe folder and all items within.