Windows 7 - Quicktime install corrupted data drive

Yesterday tried to install apple quicktime. Install failed and then I started having problems with the D data drive: "inaccessible or corrupted" messages.
I can still see the folders, files and structure in file management. However attempting to move or copy anything fails. On boot Windows 7 advised to check drive but that didn't work.
I ran western digital diagnostics off UBCD rescue cd, short and long tests no errors. Then I checked the Windows 7 install with System File checker - no problems (didn't expect any, Windows 7 boots fine). Then I tried chkdsk D:
This swiftly returned "orphan file found can't continue..." chkntfs returns "D is dirty.."

Now I am worried that if I run chkdsk /f this might be a disk wide problem and everything is going to become a .chk file
HELP advice needed!
I should add that I looked at system restore but no restore point was available prior to the apple install attempt - not sure why!
Should I attempt some data recovery first? I have a backup (paragon image) but it is a month old (due to this PC being a recent build and dilatory in setting up regular backup).
So I am hoping for some good advice from members more expert in working with ntfs problems like this...thanks

update:
installed the drive into an xp box, chkdsk did its thing on booting looks like everything might be ok....??

Mark as solved.

basically it was me ol man...
Tried to install while a bunch of other stuff was open, wires got crossed, file got corrupted on data drive.. lesson learned...

I've always found Quicktime highly annoying at best and instead use either Quicktime Lite or Quicktime Alternative, neither of which have ever caused a problem.