Hi bloubul,
it seems you cannot do much for this. Covermaster file is probably corrupted or you have been in a rare error of windows that cannot properly execute programs (very rare!). Try to get a new setup for Covermaster.
Finally, the memory problem cannot be solved, it is embedded in the code. You just have to accept that if you work with relatively big wheels & optimization, after a while Covemaster will crash, so save your work often.