The title should be enough. Whenever I use the hotkey (p) or try to select magic from the tab menu, I immediately CTD. Everything else in the game is running fine and I exceed the specifications by plenty.

Also I tried to register to the forums with my gmail account but you never sent me a confirmation...

I'm getting this exact same issue. I had about five hours of play-time in before this happened. Here's something interesting I found. Try loading a previous save and see if it works. I loaded one from a few minutes prior (five minutes or less) and was able to enter the magic menu again. However, I went through and killed a couple enemies, also gaining enough level ups to get to level five (just like I did on my more recent save) and now the magic menu doesn't work again. Quite an odd issue.

I had this problem. I tried axcessing the magic menu from a few diferant areas and it continued to CTD. But after sleeping in my bed it started working again. So try sleeping or waiting for a few hours, and maybe do so in diferant places. Good luck.

I have had this problem as well.