WLAN is breaking down if I use VNC

[bigfrog902@gmx.de]

Hi,
I use VNC 3.3.7 with my WLAN and WinXP Pro on all my PC's. It was running
very well and I didn't have problems with it. Then I reinstalled WinXP
(complete new, with fresh formatted disks...) on my Laptop, which I normaly use to
remote the other PC's. The WLAN network is running very well again, but VNC
not. I can connect to each other PC with VNC, but after the first (almost) or a
few actions on a remotted PC the network is breaking down, this means the
WLAN Adapters cannot reach their neighbours anymore (no network available). Now
I deactivate - activate each adapter on every PC and the network is running
again (if not I haveto do a restart on some PC).
The only change (that I can remember) to the prior well running system is,
that I installed the Microsoft WLAN-Rollup Patch: 
filename: WindowsXP-KB826942-x86-DEU.exe
downloadsize: 1069 KB 
public since: 31.10.2003
version: 826942

Thank you four help!!