I am just reinstalling cygwin on a fresh install of XP on a rather old laptop
with Avast as virus software.
It is absolutely crawling at the texlive postinstallation stage - stuck
showing 24-25% for at least half an hour now. I was about to give up but
googled "cygwin install hangs texlive-collection" and was surprised to
actually hit something so will leave it to run over night.
Previous installs went a lot lot quicker.
There is no /var/log/setup.log etc that I can see yet ( only an empty file
setup.log.postinstallXa03208 in C:\cygwin\var\log).
I can confirm kpsewhich.exe is taking most of the CPU.
Jeremy