"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????????