Deleting the file Export.dat
Click on START with the right button of your mouse.
Click on Explore.
If your OCLC export settings are set to go to the c:\ drive look for the file c:\OCLCAPPS\export.dat, click on it once and press the delete key on you keyboard, it is going to ask you if you are sure you want to send the file to the recycle bin, click on YES.
If your OCLC export settings are set to go to the a:\ drive then look for a:\export.dat and delete the same way.