What notebook is it? Does the same symptom occur with other cards?

I had a laptop which had a hard time with PC cards in Win2k..this was the resolution..it was for a compaq noteboook..

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Go to BIOS and search for built in device,then do:

Onboard sound ( Enable)
Soundblaster (Disable)

press F10 and confirm, dont worry your sound ssystem still work but the soundblaster comp (that cause the problem) is disabled.

Normally the problem must be solved , if still not try to update the sound driver to VIA PCI Sound Device insteat of PCI Sound Device in WIN2K.
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see if that works i know the fix sounds totally unrelated to PC card slot but it worked for me.

Good luck