QTR-Quadtone RIP

Hi All,
I have been happy, and still am, with QTR. Getting really good prints etc.
What has happened to me is; I have 2 external hard drives "L" & "N" 
 I installed  new camera software and the hard drives where off and
the letters have been reassigned, so my "L" drive is now "M" 
The problem is that the last item I looked at with QTR was on the L
drive, and when I go to FILE- SELECT IMAGE it keeps looking for the
last image in L drive. It will not let me look anywhere else as I get
the "error selecting path" message and I can go no further.
I have uninstalled and reinstalled and done a new download.
I do not see a way to clear this blockage or to clear the memory or cache.
Help required, off to the pub now,a pint or 2 of Guinness will surely
give me the answer.Will check back later.
Thanks
Gerry