Thank you for letting us know.
This problem is surprising to us because we ran into this problem long time ago and UWS installer changes Event Log settings to make it over-writable. If you take a look at the "UWS.Installer.log.txt" file in the "C:\Program Files (x86)\UltiDev\Web Server" folder, the first entry there should be a "1. Ensuring event log can grow... ". Please let us know what is the logged result there? In general, if you could attach "UWS.Installer.log.txt" file to your response, it would be quite helpful for in determining what went wrong.
Best regards,
UltiDev Team.
Please donate at
http://www.ultidev.com/products/Donate.aspx to help us improve our products.