Very very slow Lilypond uninstall on Windows

[Nick Payne]

When I install a new version I uninstall the previous one. I have 
noticed, for quite a few versions now, that the uninstall takes a long 
time. I just downloaded 2.13.7 and am waiting for the uninstall of 
2.13.4 to complete. It has been running for about 32 minutes so far and 
the uninstall progress bar is at about 80%.

This machine is dual boot. If I boot into Ubuntu and run the uninstall 
of the same version, it takes only a few seconds to complete. I've tried 
on two different Windows machines, one running Windows 7 and one running 
XP, and the extremely slow uninstall happens on both. Installation on 
both runs quite satisfactorily.

Nick