What version were you running previously?
If it was the version by Webfoot, you're probably stuck. While the two versions look identical, Caravel was written from scratch and the coding is completely different.
However, if you still have all the save files (called slot0.sav or similar) you can re-install Webfoot DROD and copy these .sav files to the new Webfoot installation. Note you cannot transfer from webfoot to Caravel, although I strongly recommend using Caravel as it is superior in many ways.
If you had Caravel 1.5 and have now installed the almost finished beta of DROD 1.6 (Architect's edition), then... well you're almost stuffed here. But again there is a way out:
Locate the file drod1_5.dat in the drod/data directory. This contains you're player data and so if this has gone, sorry, again you're stuck.
If it's still there, delete the new version you just installed. That's right, and make sure that your DROD1.5 is still in the SAME folder it was in when you installed that version. Now install DROD 1.6 to a new folder. When you run this, it should detect the old installation and ask if you want to update this version with your old information.
If you really are stuck, sorry, but it's always easier second time through - honest...
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+++ Divide by Cucumber Error +++ Please Reinstall Universe and Reboot +++
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Oook!"