Cannot uninstall OpUtil 4 after bad install on XP

Hi.

I would like to un-install a bad install of the OptUtils 4 application and try again.

I attempted to download and install the trial version of OptUtils 4 the other night. The install hung up after a statement said something like, "Installing/Unpacking, this will take a few minutes." I noticed that the hard drive was not being accessed. I waited about 10 minutes. I ran Task Manager to see what was going on. I noticed that the Performance was nearly at 100% and the system appeared to be locked up. I killed the application from Task Manager. After this sequence I concluded that the program did not install completely and would not run. I went to Control Panel and launched Add and Remove Programs. I saw the ManageEngine OpUtil 4 application listed. When selected to remove, it runs for a minute and then informs me that the application is already installed. I am looking for a way to uninstall the bad install and then try it again. The program appears to be a tool I could use effectively.

HP Pavilion
1G RAM
XP Pro

Thank you for your help.