How to delete the empty disk?

I uninstalled the program successfully, but left an empty disk after reboot. How can i remove it?

That's not really possible - if the software was completely removed, it wouldn't be able to leave an empty disk. You can check this article for how to find out whether all components of the software have been removed.

Alternatively, it could be that another device (e.g. card reader or USB flash drive) has taken over the freed disk letter and is now displayed instead of the deleted RAM disk.

Not find HKLM\System\CurrentControlSet\Services\vvramd.
The disk was not accessable, it was still there.

You should check and remove all the registry entries mentioned in the article, not just the first one.

I already removed them all, but the disk still there.

Have you rebooted as well, as the article recommends?

Yes, but not worked.

In this case, check in the registry if the stubborn drive letter is listed there:

• HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices

419e5a43-5a0e-11e7-864f-806e6f6e6963 may be the error disk.

[HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices]
"\\DosDevices\\C:"=hex:19,49,26,41,00,00,10,00,00,00,00,00
"\\??\\Volume{419e5a43-5a0e-11e7-864f-806e6f6e6963}"=hex:5c,00,3f,00,3f,00,5c,\
00,53,00,43,00,53,00,49,00,23,00,43,00,64,00,52,00,6f,00,6d,00,26,00,56,00,\
65,00,6e,00,5f,00,54,00,53,00,53,00,54,00,63,00,6f,00,72,00,70,00,26,00,50,\
00,72,00,6f,00,64,00,5f,00,43,00,44,00,44,00,56,00,44,00,57,00,5f,00,53,00,\
4e,00,2d,00,32,00,30,00,38,00,46,00,42,00,23,00,34,00,26,00,33,00,30,00,38,\
00,32,00,63,00,36,00,31,00,32,00,26,00,30,00,26,00,30,00,32,00,30,00,30,00,\
30,00,30,00,23,00,7b,00,35,00,33,00,66,00,35,00,36,00,33,00,30,00,64,00,2d,\
00,62,00,36,00,62,00,66,00,2d,00,31,00,31,00,64,00,30,00,2d,00,39,00,34,00,\
66,00,32,00,2d,00,30,00,30,00,61,00,30,00,63,00,39,00,31,00,65,00,66,00,62,\
00,38,00,62,00,7d,00


[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices]
"AUX"="\\DosDevices\\COM1"
"CON"="\\Device\\ConDrv\\Console"
"CONIN$"="\\Device\\ConDrv\\CurrentIn"
"CONOUT$"="\\Device\\ConDrv\\CurrentOut"
"MAILSLOT"="\\Device\\MailSlot"
"NUL"="\\Device\\Null"
"PIPE"="\\Device\\NamedPipe"
"PRN"="\\DosDevices\\LPT1"
"Silos"="\\Silos"
"UNC"="\\Device\\Mup"

From this data, it is unclear what it relates to. I would not recommend deleting it, as could pose a risk of system instability.
Based on the supplied information, we are not sure where that volume originates from. There have been no reports of a similar problem from any RAM Disk users in the past.