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#51
I'd just not do the file system check on data drive until you get Win7 installed.
To run chkdsk on C, boot Win7 DVD, select Repair on second screen, click through to Recovery Tools list to open a Command Line, type:
CHKDSK C:
CHKDISK /F
After chkdsik has scanned/repaired file system, boot GWScan CD to run full HD diag/repair scan on C, then boot Win7 DVD and install to C: