1st I must say to my Windows Friend trying to use Amiga:
DON'T PANIC!
The most of the errors you can do on Amiga are sure recoverable...
Take a breath, and keep listen...
1) Now I read some comments above that you have a DH2:

? icon on the desktop... IS THAT CORRECT?
{Please answer this question first)
This means that you corrupted the Hard Disk partition because it is now formatted incomplete...
To save files on it it could be necessary to use programs such as DiskSalv...
But as I said previous DON'T PANIC!
2) Seems to me that system boots quite well, so Partitions DH0: and DH1: should be unharmed... IS THAT CORRECT?
{Please answer this question second)
3) Your system boots correctly?
{Please answer this question third)
4) A little simple reminder:
Usually Amiga uses DH0: as primary HDD partition:
5) SYS:
It is the device who made the boot (It could be either one floppy, one CD, or one HD)
You can access boot device by referring as SYS:
6) Amiga uses slash as in Internet/Linux.
"/"
7) While Windows uses the slash BEFORE ANY DIRECTORY, Amiga have no need of it on the first branch directory...
Windows:
C:\Windows
C:\Windows\System
Amiga:
SYS:Prefs
SYS:Prefs/Storage
8)Accessing directories in various ways:
DH0:C
SYS:C
Workbench:C
C:
These syntax examples usually refers to the same directory of commands...
9) Any Directory in Amiga could became a DEVICE. Main directory are ALREADY addresses as they were virtual devices, so you can access it IMMEDIATELY.
C:
It is the absolute path for directory of Amiga-DOS commands used by keyboard based GUI console (CLI or SHELL).
Yes! You can referring to main directories of Amiga as they were DEVICES.
10) Have you seen this utility directory somewhere on the Hard disk?
If this exists, you can easily transfer files from any directory, or device to another:
Directory OPUS or DirOPUS


(Please answer this question fourth)
11) Amiga Floppy Disks.
Amiga acess normal DOUBLE SIDED DOUBLE DENSITY Floppy disks of 3,5 inches.
While MS-DOS format it at 720KB, Amiga gains some more kilobytes and format it at 880KB.
This is due to the fact Amiga stores on DD Amiga floppy disks 512 bytes/sector 11 Sectors/track 2 sides 80 cylinders.
So Amiga disks could be loaded with more DATA than a normal PC disk.
You can access even 720KB formatted PC disks because Amiga have a total control over motorsteps of Floppy read/write header.
PC disks are accessed thanks an utility called CROSS-DOS
Amigas usually are equipped only with DOUBLE DENSITY floppy drives, so you can't use 1,44 MB PC formatted floppies.
11) To format a FLOPPY Disk:
A) Check that there are no floppies in any drive.
B)insert disk you want to format in the floppy driver.
C) Check the new icon of Disk that will appear dinamically on the desktop window
D) Click on it with RIGHT MOUSEBUTTON
(PLEASE CLICK JUST ONLY ON THE FLOPPY DISK-LIKE ICON THAT JUST APPEARED.
YOU CAN SPOT IT BECAUSE IT APPEARS DINAMYCALLY WHEN THE DISK WAS INSERTED)!
E) New floppy icon should be usually named DF0:

?
(Note the four "?" in the name)
F) Choice FORMAT from the Pull down menu
G) Follow progress bar indicator
H) DONE!
Now you have a floppy disk formatted to transfer any kind of data between the two Amigas in the church...