Hi-Speed USB 2.0 Notebook Card Freezing my pc

Hi all,
I have a compaq notebook presario V2405US.
Firstly the usb ports don’t seem to work, I get the
error message which states a usb device has
malfunctioned. I have tried everything to resolve that,
reinstalling drivers, and the devices themselves with
no luck.
So I bought a JUSB 2.0 Notebook card.
However, every time I plug it in, it’s recognised and
everything is fine. Then when I plug in something like
a usb memory stick again it’s recognised but when I
try and open what’s on the stick I get an egg timer
then everything freezes, it’s only when I unplug the
card that everything is freed up again.

It’s so frustrating. Does anyone have any ideas?

thanks very much
Gem