Thank you for your post Jg,
As per the description of your issue it seems that you have your network set up with a short preamble and that you are trying to use a legacy standard such as 802.11b.
In case you want to use a legacy standard then you must use the long preamble set on the router configurations.
Here is the link for the preamble explanation:
I hope this helps.
Thanks for the quick response, Victor! I think there's a slight misunderstanding though - I'm using Wireless Hosted Network so the Centrino laptop itself is the access point.
When I look at the options on the adapter in Device Manager, it seems like there's no way to control or set preamble. Here's an example screenshot from a Centrino Wireless-N 100:
I'm basically trying to find a way to have the Centrino (when acting as an AP via Microsoft's Wireless Hosted Network API) advertise 1, 2, 5.5, and 11 Mbps rates in addition to the OFDM rates (6, 9, 12, 18, 24, 36, 48, 54) when in b/g or a/b/g mode.
Thanks again for your reply!