I installed Solidworks student edition 2017 last week and made some 3D parts and it worked fine.

However, this week as soon as I try to sketch the first line on a 3D part it freezes completely. Only ending solidworks in the task manager stops it.

And this happens with any sketch element i try: text, line, circle etc. At first it runs smooth as ever and as soon as i try to sketch it freezes.

What should i do? (computer restarts haven't helped)