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USB msc+cdc compostie in win7 not work !!!

Dear all, my usb msc+cdc composite project work well in winxp ;but in win7,my cdc vcom could not recieve&send data;my cdc inf file is mchp_MSD_CDC.inf,is ok in win7,because cdc project also work well in win7.

when (win7) reinstall&uninstall vcom deriver in devicelist,pc requrie a long time.