Early in my attempt to upgrade (in place) from WinVista Home Premium (32 bit) to Win7 Home Premium (32 bit), I fail a compatibility check on the grounds that ". . . the hard disk partition is formatted with an unsupported version of the NTFS file system." I'm told to do a clean "custom" install instead, something I was trying to avoid.
I'm mystified by this, since my switch from FAT32 to the NTFS format was made in the first place when reinstalling Vista on a new (replacement) (Seagate Barracuda) hard drive. In other words, I can't see any reason why my NTFS format should be other than fully in line with MS's requirements.
Is there anything else I can do about this other than bite the bullet and do a clean install?

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