[Port FW] IP keep changing on LAN side

[SpAwN]

Hi,

Before the edit:
My router keeps changing the IP's on LAN side, but since i forward couple ports (Virtual Server) my applications dont work good anymore.

For example yesterday my main PC had 192.168.1.2 and when i woke up the IP was changed to 192.168.1.5
I didnt even reboot my PC

I am on WinXP Pro and my firmware is 1.9.2.7 (Standard Asus)

EDIT:
Ok I have Manually Assigned IP's
I hope it doesnt give any problems, like unstability...

Btw what firmware do you guys suggest? I dont need anything special for USB if my connections work stable and i can use my printer i would be glad.
So no fancy things just a stable router is enough for now :)

I have next devices on it:
2 PC's
A wireless connected Laptop
A Xbox
A HP LaserJet 6L printer.

Thanks :)

[tazmez]

removed post because of dutch text (see current policy)

for an answer see this post 2111