Please head to: https://steamcommunity.com/my/profile -> Sign in -> and copy your browser's URL, then paste it in this field.
You can obtain a DXDIAG by following these steps:
> Click the "Start" menu
> Type/Search for "DxDiag" and click "Ok".
> In the new window, click on the button labelled "Save all information"
> A "Save As.." dialog box appears. Choose a handy destination and click "Save".
> attach the 'DxDiag.txt' file at the bottom of this page.
> Tick above to acknowledge that this has been attached.
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