RE: Dell XPS 15 9550 issues
Hi SYED MUHAMMAD ADIL,
Rather unfortunate that you are facing issues on a recently purchased machine.
However, based on your description, the issue seems more likely an OS related as the hardware tests have passed.
Regarding the drivers being listed on Support Assist or Auto Detect, if the drivers are already installed, then you could ignore it, as it might be a glitch / OS conflict.
Secondly, the intermittent Outlook freeze / blank screen, since the issue is seen only with Outlook, have you set this up with a pst or ost?
Enable the builtin admin account and check - http://bit.ly/1JoFhcw- this will help isolate if the issue is profile related or not.
Also, please click my DELL-username and write me a private conversation with the service tag and your Name for case records.
Let us know if you have any other queries.