CDRW cannot read or write in Win XP

Hi all,

I've got a problem. I have a CDRW (Ricoh rw7120a, a quite old model with 12x cdr burning speed) installed with a WinXP. Recently, the CDRW cannot read or write any CD disc (include CD, VCD, CDR...). Although I can find the cdrw inside WinXP, but the drive always show "Blank" for all CD discs.
I think this is not the problem of the CDRW itself, since I can use the CDRW in DOS and can use it to boot up the system. However, it doesn't work inside winXP.
Can anyone suggest some solutions?
Thank you very much!

Steven