Can you post a screenshot of the disk management window? Click on Start button, type "Diskmgmt.msc" without quotes, hit Enter.
for late reply.
Have already done "clean all" then installed, so too late for screenshot.
I could repeatedly delete/merge all partitions and when I created the 100GB OS one it would always be there, an extra 0.0MB Unallocated.
It was OK this time, back to normal after the clean all.
I am doing diskchecks (with both options checked) for both partitions (C: & D) and will find the output file to read, in case of bad sectors. Just managed to read "0 bad sectors" for C: before it completed, and screen went, so hope D: ok too.
Should there be a few bad sectors anyway on a 500GB or are they usually perfect?
Many thanks for any replies.