2408wfp SD Card reader not working

I have just tried my SD reader for the first time and nothing happend.... clicked in but did not recongnise it at all...?? I have the lastest monitor driver.... everything else works fine....? USB is working.... but not SD reader.... have not tried the other reader... have not got anythign that goes into it...

Am I missing something here...???

I have a XPS 620 Vista 32 bit Ultimate version.

Thanks

Dave