Hi,
downloaded vdiskmanager and added to VMPlayer folder. It run fine, telling me that the virtual disk was corrupted andhas now been repaired.
Then went back to vCenter converter standalone and configured the machine. Once again the result was "unable to reconfigure the destination virtual machine".
Looks as though this is not going to work.
Looked in worker log and once again "the specified virtual disk needs repair". So either vdiskmanager did not repair it or it is a general problem.
Thanks for your help.
Regards,
John