Windows XP Bluescreen Stop 0xA (0x40009E1,0, 0x804D9B64)

Dell Notebook, 4 years old
IRQL_Not_LESS_OR_EQUAL
Bluescreen Stop 0xA (0,0, 0x804D9B64)

Solution:
Start Notebook with Key F8
Save Mode
Open Device Manager
Inactivate Intel WLAN Driver

Start Windows Normal

De-install and install newest Driver for WLAN