WIFI no WPA Personal as Security

I started with Ubuntu yesterday by installing 11.04. At first my Asus WL138G with Marvell chipset was not recognised and found out I needed to install the ndiswrapper application (or Windows Wireless Drivers as it is called in Natty). I installed drivers and after a reboot (I always thought Linux hardly needed reboots) my network card was recognized and my wireless lan showed up in the list. But connecting to it seems to be a problem, in the Wireless security list I can select WPA & WPA2 Enterprise, but I want WPA & WPA2 Personal.

nm-tool shows

- Device: wlan0 ----------------------------------------------------------------
  Type: 802.11 WiFi
  Driver: ndiswrapper
  State: disconnected
  Default: no
  HW Address: 00:15:F2:66:D7:F4

  Capabilities:

  Wireless Properties
    WEP Encryption: yes
    WPA Encryption: yes

  Wireless Access Points
    House of Aerillia: Infra, 00:1A:4F:95:72:3C, Freq 2437 MHz, Rate 54 Mb/s, Strength 17 WPA Enterprise

So the problem probably lies in the fact that the network is identified as having Strength 17 WPA Enterprise, but so far each device could connect simply with just the WPA2 key.

I tried adding House of Aerillia as network connection with WPA2 Personal and then tried to connect but connection failed.