Disk manager problem

I am not sure whether this is a Disk problem, a Windows
XP problem or a Drive Image problem. What do you think
and suggest?
I am using Drive Image , but it comes up with the
following messsage:

Error 91
Disk manager has been detected on drive 1 (my slave), but
Disk manager is not running. If you are booting from a
floppy, remove the disk and reboot. Press and hold the
<space bar> key as the computer reboots. When prompted
insert your boot disk and continue boooting.

I am not booting from a floppy, Drive image is rebooting
the system.
Any help will be appreciated.