If you have ADTS installed on your machine already, especcially if you on on Win98, uninstall it before you install WSDT 5.1.0. The sees the IMNNQ directory and thinks it is already installed. It creates a IMMNQ_98 for 5.1.0. Not the cleanest install from older versions. On my machine I basically had to delete the registry edits for NetQuestion and Distributed Debugger, as they already existed from the ADTS version of the program, then reinstall. Our shop has standardized on Win98 on all desktops and won't install XP unless forced to somehow. We have had systems come in the door with ME that can't be booted no matter what you do.