cabal-install fails on WinXP

[Alistair Bayley]

> http://hackage.haskell.org/trac/hackage/ticket/545
>
> fetch -v3 output below. Seems to be trying to use a proxy, but that's
> not necessary as the machine is "directly" connected (via a router).

On my machine, IE has proxy settings configured, Firefox does not (I
rarely use IE). cabal seems to use IE's settings; if I change IE so
that it does not use a proxy, then it's all good.

Thanks,
Alistair