Recent Problem with Computer. Last guess is faulty motherboard.

Khorneflakes40k

Honorable
Dec 3, 2013
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I'm not exactly sure where to post this at, this was my last best guess as to the cause of my problems.

i've come across a problem with my rig here recently. There doesn't seem to be a set action that triggers it, however it occurs the most while playing Final Fantasy XIV A Real Reborn. When this problem occurs, simply pressing the "tab" button executes alt-tab. Hitting ESC brings me to my desktop. Double-clicking to open files, open the properties tab of that file and clicking links in any browser prompts a download of said link.
Any help, at all? I've reinstalled and formatted my harddrive twice now, problem still occurs.