"the disk where windows to be installed is locked" messege & not reinstalling or refreshing os 8.1

hi,i built my cpu with amd apu a8 6600k, ga-f2a85x-d3h MOBO, and 2133 bus 8gb ram, non brand power supply 500wt, 2T WD HDD, and sony bravia led TV connected with HDMI cable as temporary monitor & win 8.1 OS. i am so far satisfy with performence of this config. But i am facing a problem with sys startup as win need 2/3 attempt to start restarting every time. when i tried to install os "the disk where windows to be installed is locked" messege is showing & not reinstalling or refreshing os 8.1. i dont understand which causing the prob. can anyone help me on this matter????????
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More about disk windows installed locked messege reinstalling refreshing
  1. What graphics card? - might be overloading the PSU.

    Is disk shown in bios? Have you changed bios settings lately? Are your HDD cables properly connected?
  2. No external graphics. Is disk shown in bios? YES. Have you changed bios settings lately? NO. Are your HDD cables properly connected? YES
  3. What did you change just before you got this problem?
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