Hi there!
Let's try a few possible work-arounds.
Installation may not work properly if MSI file is simply double-clicked, because Windows 7 may not run installation in the elevated administrative user mode, which is required for the installation of UltiDev Cassini. To work around it please try to
download and install the web server from our web site. If that doesn't help, please
contact us via email and we will email you a build working around some known Vista/Win7 installation issues.
Please also check if there is any error entries the Windows Event Log (Application) related to UltiDev Cassini.
Please let us know how this has turned out.
Best regards,
UltiDev Team.
Please donate at
http://www.ultidev.com/products/Donate.aspx to help us improve our products.