Cubase LE 4 drives me crazy

Lately, I wanted to record some music with my computer. About a year ago, I bought the Digitech RP350 Modeling Guitar Processor, which had a free copy of Cubase LE 4 in it. I installed the program, registered it and everything worked fine, it even said my copy was "permanently activated". But, I wasn't able to record any music with it, so I just forgot about the whole thing.
Then, yesterday, I finally wanted to figure out what the heck was wrong with it. And now there's a new Problem with it: as soon as I want to start it, a pop-up says "Syncrosoft Protected Object Server stopped working", and then it says "Cubase LE 4 stopped working", and then it just closes itself. This happens out of nowhere, I haven't even opened the program in about half a year.
I googled the sh*t out of this, did everything anyone said, the official Steinberg response hasn't done anything at all, I reinstalled, cleaned registry, whatever the f*ck i could make up.
And it still doesn't work.

The ironic thing about this is that all the pirate copys I have work perfectly fine, and the ONE program I actually bought breaks down first.
And the only thought I have left now is for god's sake f*ck this shit