Unfortunately there is no useful information in the provided error log entry that would help us understand what is wrong. Even though we haven't dealt with this issue before, we'll try to troubleshoot it with your help.
We assume that when you are installing the product you are logged as a user with Administrator privileges.
Could you please tell us if there is "UltiDev Cassini Web Server for ASP.NET 2.0" product in the Control Panel -> Add/Remove Programs? If so, try uninstalling it and if uninstallation succeeds please check whether "C:\Program Files\UltiDev\Cassini Web Server for ASP.NET 2.0" folder is still present. If so, delete it. Reboot the PC and check Control Panel -> Administrative Tools -> Services to ensure that "UltiDev Cassini Web Server for ASP.NET 2.0" service is gone. If you have any troubles removing the product please let us know.
After UltiDev Cassini Web Server product is removed, please clean up the Event Log (Application) and install the product again.
Refresh Event Log view and export it as the EVT file. Please
send us an email so we could respond you with the address to send the EVT file to.
Best regards,
UltiDev Team.
Please donate at
http://www.ultidev.com/products/Donate.aspx to help us improve our products.