Starting problems

Hey guys,
recently, I started having starting problems with Dark Souls. I am not able to run Dark Souls normaly, nor start it per Steam. Only chance for me to start Dark Souls is to right click -> run as administrator. And even this method is not working sometimes. Got any ideas? Maybe it has to do something with DsFix? I had no problems at all about a month ago

Hmm....what happens when you try to start it? Did you change anything related to the game or GFWL before this error started appearing?

It's strange, if you are sometimes able to run it as administrator I don't think it has anything to do with DSFix... if DSFix was the one giving trouble then the game should never work, administrator or not. I smell a problem with GFWL...

I haven't changed anything. When I try to start the game, there is no
windows opening, nothing, but the task manager says that dark souls
process is running. Then it closes after 15 sec.

Reinstall it.

If that doesn't work, reformat/reinstall.

Also, you could try opening the GFWL marketplace or whatever its called before starting the game