Vista - Problems with PCMCIA firewire card and crashes

Hello,

I've got window's vista, and recently bought a "Combo Cardbus" PCMCIA card
which gives me firewire and additional USB connections. When I put it in the
slot on my laptop windows vista automatically installed a driver. However if
I plug any USB or firewire device into it the system will work for around 5
minutes and then suddenly freeze, meaning the only way I can stop it is to
turn it off with the power button.

Is there anyway around this? Is my card not vista compatible? Can I get a
different driver from somewhere (I've tried searching for new drivers both
through windows device management and on the recommended site
http://www.drivers-download.com from the user manual on the card)?

I'm using an Acer Aspire, with windows Vista home premium.

Many thanks.