Dell Inspiron 600m Owner's Manual page 93

Click Properties.
2
From the Network Authentication drop-down menu, select Open.
3
Earlier versions of Dell wireless software may not contain the
drop-down menus. If you are using an earlier version, select the check
box labeled Data encryption (WEP enabled) and go to step 5.
From the Data encryption drop-down menu, select WEP .
4
If the wireless network does not require a network key (for example,
5
password), go to step 8.
De-select the check box labeled The key is provided for me
6
automatically.
Setting Up a Home and Office Network
93