Hi all, I
have searched but couldn't find anything

I have an WinMo6.5 HTC HD2 with a neat "Wireless Router" app.
The "router" supplies internet access via the phone's HSDPA connection over an ad hoc wep connection.
This works fine with GF's Vista laptop but, although I can "see" the HD2 network SSID and have input the wep key (10 digits e.g. 1234567890) network centre tries to connect for about 30 secs and then says "connection failed"
My laptop T41, PCLOS 2009.2 fully upgraded to KDE4.3, connects fine to my WPA2 router.
I suspect it's an IP address request timeout or similar but the HD2 router app doesn't have any other configuration options other than SSID and Wep key.
Where should I be looking to find the connection problem?
Any help appreciated, I just want to get/send occasional email/attachments from my laptop on the move
Kim