The GUI version of ITEMAN (ITMANW32) requires .NET 1.1 to run. Neither .NET 2.0
nor .NET 3.0 satisfy this requirement, so the .NET Framework Version 1.1 must
be installed.
Please visit the following Microsoft site for information on determining if .NET 1.1 is installed
on your system, and general download instructions:
Once installed, please use Microsoft Windows Updates (either by going to the Microsoft Windows Updates website using Internet Explorer or using the Windows Vista utility) to install more recent security updates.
Source: Assessment Systems Corporation technical support