Okay, here's what I did to track down the problem: 1. Re-install over existing installation: - Win2K - Service packs, critical updates, etc. - Miscellaneous software - Internet Explorer 6 RESULT: Windows Explorer still crashes constantly. :mad: CONJECTURE: Maybe some evil file is hanging around from earlier installations. Try again. 2. Format hard drive. Re-install: - Win2K - Service packs, critical updates, etc. - Miscellaneous software - Internet Explorer 6 RESULT: Windows Explorer still crashes constantly. :mad: CONJECTURE: Maybe IE6 conflicts with some other software that I depend on. Try again; this time, install the software in a different order. 3. Format hard drive. Re-install: - Win2K - Service packs, critical updates, etc. - Internet Explorer 6 - Netscape 4.78 RESULT: Windows Explorer crashes constantly. :mad: CONCLUSION: IE6 is incompatible with Netscape 4.x :(( HOWEVER: I un-installed Netscape. The problem persisted. :mad: Try again. 4. Format hard drive. Re-install: - Win2K - Service packs, critical updates, etc. - Internet Explorer 6 - Miscellaneous software, NOT INCLUDING NETSCAPE 4 RESULT: Everything works okay now. :) So, IE6 is incompatible with Netscape 4. Mozilla installs and runs without any problems, so I assume Netscape 6 would be okay also. I only kept Netscape around for one particular site, which I can live without. Mozilla and Opera have been my primary browsers for a while now. Those who are paranoid about Microsoft might suspect they deliberately planted a Netscape killer in their software. Others may ascribe the whole mess to incompetence. Certainly I expect better from Microsoft.