1200 restore help?

[Jessecue]

Hi,
I have 2 Amiga's one a 1200 with a HD, the other a 2000 with a add on board and 030  CPU.  I was playing with the 1200 after a few years of no use...it was working fine but my daughter tried to copy something on  the work bench screen and now it won't boot up from the hard drive...Question is what can I try to fix without having to re install work bench?

[Jessecue]

I got my comPuter boot it up using the workbench install disk
Under shell i get this "unable to open your tool sys:system
/CPI

Wbs startuP drawer is empty
On bOotup with only hard drive all I see is the mouse pointer
I really need help here.   I have disk master on hard drive
Thank you