FIXED
After going through every step, uninstalling manually, running CCleaner, running as admin the problem persisted. By this time I also had succesfully installed SW BF on a laptop, so I knew this was PC related (and not origin/EA).
I ran a clean boot (through MSConfig) and still the problem was not solved and Origing stopped working, which means it wasn't interference with another program like an antivirus. But i noticed i was running a select booting sequence (afaik i did not manually change this), so I selected the normal startup procedure which loads everything and afterwards Origin worked as normal like the week before. :D
So if others have this problem, might want to check THIS (= clean boot)
Good luck!