Can't open files - FM crashes!

[Leah]

FM 7.0
Windows XP
 
Everything worked fine yesterday.
Suddenly I cannot open any of my FM files.
I get an Internal Error message and FM creates an error log. Sometime this
error message appears after opening a few files in a book and sometimes when
I open just one file.
What to do? 
Actually IT did fool around with my computer last night. 
What to do?
HELP!
 
TIA,
Leah Smaller
Technical Writer
Certified Feldenkrais Method practitioner
leah at compulite.com