We encountered this here once too - it looks like PlecoDict's settings (stored in the registry) can sometimes get corrupted on a can't-find-files startup. We should be able to eliminate this problem in Beta 3, but as for your immediate situation, if you download a registry editor program for your PPC (there are several out there, like the free PHM one http://www.phm.lu/Products/PocketPC/RegEdit/) you can remove the offending data using that. Just go to \\HKEY_LOCAL_MACHINE\Software\Pleco Software\PlecoDict\ and delete all of the keys listed under there to clear out those corrupted settings. After that, the software should start up normally.