Please, we are needed of some information.
a) Which version of Windows?
b) Specify "unstable".
c) There's no relation between your WiFi and an deleted/not-in-use Operating
System. Specify a little more about your disconnection problem. It can be a
Windows problem or a hardware problem of your computer or the one that gives
you WiFi.
Also, you can try Trisquel using the Live-CD which does not alters your
system in any way.
I think there's an option not to install Grub in the MBR and, ven though,
dual booting.
