Vista problms with wireless connectivity

Hi
I have 2 laptops with vista and 2 with windows 7.
I was with sky and now with bt and both have told me i cant get wireless on the vista laptops due to an error with vista.
The windows 7 laptops work fine wirelessly.
Can you help me with advice about this problem and any workrounds. It connects wirelessly then disconnects and keeps doing that.
BT just spent an hour taking over my laptop and referred me to vista.

Need some more info. What is the make and model of your router?
Open Device Manager and see if there are any red x's or yellow flags next to your network adapter. Next, open a command prompt, Windows Key + R, type cmd and then type the following without the quotes and paste all the results back here, "ipconfig /all". Also check, open IE, click Tools, Internet Options, Connection Tab and then the LAN Tab and in the window that opens make sure that all the check boxes are clear, if not clear them and close IE and re-open IE.

a follow-up questions what is the exact error message you are getting with windows vista computers.