Data recovery from a CD...

Hey out there,

I have a CD that was burnt in some strange way that is not readable on
regular CD Drives. Looking at the burnt area of the disc shows the
data starting about 2.5 mm from where it should. (Some blank space
near the centre of the disk).

I have searched for recovery methods. The only info I found was
describing it as possibly a multi-session disk. Not sure exactly what
that means. A solution I saw was to try to read it with a WIN98
machine. So I tried, to no avail, using Virtual PC then an actual
machine each with WIN98 loaded.

Does anyone out there have any further suggestions?
The data belongs to a non-profit org serving children.

Cheers,
Nusheen