Stop directory & folders changing in link when moving file
 

I am at my wits end with what appears to be a simple problem!
workbook b links to workbook a
workbook b is opened by a macro in workbook a
all is perfect,
except i need to write it to disk and then the user saves it back to
hardrive, this results in a series of directory and folder name
changes. essentially the final products end up in the same state they
started out in, but the linking formula in Workbook b's cells has
automatically changed the path name, which doesn't automatically change
back as it has now become read-only due to the burning process.

Is there any way of stopping the drive letter in my formula (C:) from
changing (to D:)when I copy and paste?

Any advice would be great.
Thanks
Bella