From the horse's mouth:
Hi Daniel
I don't know why this problem cropped up; naturally the FindGlyph program does not itself muck about with people's operating systems: it's really just a little script bundled up with some MS Visual Basic runtime libraries, and the installation program is all Microsoft's. I ran the installer myself just now (on Win2k) and I noticed that it suggested I shut down other applications in case it had to "install system files" or "update shared files". This is an entirely generic message built into Visual Basic's installer program. Your colleague's report is a bit thin on actual details, so I don't know, but this may be what they're referring to? If so, it is actually quite normal for VB programs to depend on several runtime DLL libraries which are often, but not always, already installed on users' computers. Typically the installer program will pop up a dialog box when there is an existing version file, and offer the user the option to keep their existing file, or replace it with the newer version.
HTH
Con
I did get the same warning about shutting down other applications when I installed, but like Con, didn't see anything unusual.