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Do you have a new AirPort Express, one that supports 802.11n WiFi? And did you set it up to work only with 11n devices? It may be that your roommate's DV6000 only has an 11b/g card and cannot work with 11n networks.

If you are using WPA2/WPA  to secure your WiFi, for a mixed Mac & Windows environment you should limit your WiFi names and passwords to just basic letters and numbers because Macs and Windows machines handle some characters (like accented letters) differently. While this does make it easier to crack into WPA WiFi, you may not have much of a choice about this. You can compensate by using a longer password--for this you can go to GRC's Perfect Password Page where passwords in several forms are generated each time you load the page.

If neither of the above helps, then perhaps you can supply us with some more details on how you have your AirPort Express set up.

r_o_b_s_o_n wrote:

I don't have the new express, I have the one that supports b/g.  with the default firm ware.  I believe the problem comes into play with the encryption/security settings.  What settings should I use for compatibility??

WPA2 is preferred although WPA is likely enough for encrypting wireless traffic. WEP is hopelessly breakable--a current computer with the right software can crack WEP in less than a minute--and should not be used on any WiFi network where security is any concern. For the name of your network and its passwords, please read the second paragraph of my previous post.

I did a Google search using "airport The saved settings on this computer do not match the requirements for the network" as the search terms and eventually found these two pages (one and two) which may explain how to connect your roommate's Vista machine to your secured WiFi network. The problem seems more due to Vista's less-than-obvious way of making a secured connection as opposed to the AirPort being the problem.