Hi, I'm a *nix guy who hasn't used Windows since Win95, but being the 'tech' guy in the family, I'm called upon to fix problems (I'm sure we all know how that goes , so please bear with me on this.

My sister's computer (custom built, specs can be provided if needed) has recently run into some problems, and all my Googling, virius / spyware removing has done nothing to fix the issue. The machine is running Windows 2000 (5.00.2195 Service Pack 4). Recently, whenever she tries to delete a file (either by right clicking and choosing delete, or pressing the delete key on the keyboard), Explorer will shutdown and restart without deleting the file. This only affects files though, as she can delete directories. The only information logged in the Event Viewer when this happens is, "The shell stopped unexpectedly and Explorer.exe was restarted." with the source of that event being 'Winlogon'. She claims that the only thing that she has installed in the past few months are Windows updates from Microsoft.com. Checking her log for this shows the last update to be on 13 Oct 04, which she says is about when the problem started. Does anyone have an idea of what I can do to fix this problem? TIA.