InDesign CS2 ME damages files

Greetings
I have a problem. A book in Arabic containing 15 pages and another file containing 270 pages using Lotus Linotype Arabic font was set. The problem is that these and other files cannot be saved on a memory stick. The following messages appear:
Adobe InDesign is shutting down. A serious error
was detected. Please restart InDesign to recover
work in any unsaved InDesign document.
and:
Cannot save <xxxx> under a new name. The file
<xxxx> is damaged (Error Codes 2)
also:
Cannot copy with <xxxx>. The directory or the file
cannot be created.

Corrections can be made and fikes can be printed to
the HP Laser printer with no problem.

My InDesign CS2 ME is a legal copy purchased from
Winsoft France.

Your urgent response requested.

Regards

Muhammad Ebrahim
Johannesburg
South Africa

ilmi@iburst.co.za