@ Tenacious's original post
I have a similar-ish, very odd problem on Win2k that I haven't manage to figure out anything about or fix.
If I go into Start > Search > Files and Folders, do a search for anything, then right-click on a file/folder and select 'open containing folder', another search window appears (instead of an explorer window), and I can't close the parent search window for about 30 seconds, but I can do other stuff with it.
No viruses, spyware, etc. Win2k SP4. Survives a service pack reinstall, and doesn't just affect one user (tried creating another). Also tried a scan with sysinternals.com's 'rootkitrevealer', no dice. Nothing interesting came up through file or registry monitoring, no errors in event log.
I reinstalled late last year to get rid of the problem, which it did (as I do a wipe-clean install on my Windows partition), but then it appeared again some point later (like a few months I think), and I couldn't track it down to anything I did, because obviously I don't search for stuff on my computer very often, but when I can't use that functionality, it is very annoying and tedious to work around it.
- edit - whoa! just fixed it, cool

I added a function into the folder context menu, so that I could browse the folder in xnview, apparently it doesn't like spaces in the name for the new menu item. bizarre.