Vista - Vista Ultimate 64bit power(?) problem!!!

Hi

Need help..!

I have installed vista ultimate 64bit but now vista wont boot if i have the power supply plugged in (i have a laptop)... I does boot without the power supply cabel plugged in, but vista runs very slowly and so does the internet connection. I cant install any programs, tryed to install messenger but it just freeze when it says " installing". Cant download updates from windows update, it says " downloading updates" and nothing happens.

And if i plugg in the power supply after Vista booted, the battery charges for about 30 sec then it just stays in for example 50%... The battery doesnt run out of power but it doesnt charges... And when i shut down the computer it freezes at "logging out" and i have to turnt it of manually.

Everything works fine in safe mode..!

I should mension that when i tried to install Vista, that didnt work either with the power supply cable plugged in... just freeze just before the "choose language" meny pop up, and when i tried without the cabel i worked just fine...

I have tried different ISO disks with Vista Ultimate...same problem

PLEASE HELP!

I had Vista home premium before and never had any problems...

My hardware is...

Fujitsu siemens Amilo a1667g
amd 64bit +4000
1 GB RAM
80 GB HDD


thanks/// Hazze