Read the article andy excerpt below:
Windows XP Update:
Installing the Ramdisk sample driver in a NTFS only machine might make
it unusable. To resolve this problem make the following change:
While you call the IoCreateDevice function (RamdiskAddDevice function in
pnp.c), change the device type from FILE_DEVICE_VIRTUAL_DISK to
FILE_DEVICE_DISK and recompile the driver. After you install the driver,
restart the system in order to access the Ramdisk through Explorer.
Warning Installing Ramdisk in Windows XP may render the System Restore
feature useless.
