Can't connect a DR-07X to the PC

[Alemraq]

Hi, I've got a problem with my DR-07X. When I try to connect it to the PC, an options screen pops up on my recorder (so apparently it realizes it's connected) but nothing appears in the My Computer folder, no new devices are found. So I tried different microUSB cables, different PCs and I also tried connecting the DR-07 before and after it's turned on, but nothing's helped. Any solutions to this problem?