Broken Wireless Network

I set up a wireless network that looked like this:

Internet --> Wireles Router --> XP Desktop --> Printer
|
Vista Laptop

This was all working fine until I started tweaking vista on my laptop and
downloading vista updates. Then suddenly, my vista laptop can't detect the
desktop, although my desktop can detect the laptop (although it can't access
it).

I've installed all updates for vista between installing the network and this
problem.
I've changed services in services.msc. Although I've changed it all back to
what it was before.
I removed some 'Windows Functions' from 'Control Panel/Programs/Programs and
Features.

Anyone out there can help me?