I have just purchased an Xtra Wireless Modem Kit - installed fine on my Acer Aspire Lappy (Computer only 2 months old) - the laptop can "see" the modem fine, but when I click connect it comes up with "Windows cannot find a certificate to log you into the Dlink Network" - and wont go further than that.  If I use an ethernet cable to plug into the router, I can communicate with it and surf the net, but just not wirelessly.  The only way I could figure out how to do it, was to change my security encryption on the laptop to "open or shared" and change it to 64bit.  This fix allows me to surf for about 15 minutes, then it just suddenly stops.

When installing the modem using the installation CD - it just wont work on 128 bit.

I rang the Broadband Helpdesk, the first phone call lasted 1 minute, the guy said it was a problem with my OS and I had to call Microsoft to download something or other! (microsoft are closed in the weekends!)  The second call, was about 30 minutes long and we changed heaps of settings manually on the modem, but still could not nut it out.

Has anyone experienced this?  Can anyone tell me where to download appropriate stuff to fix this?