What error message do you get when the unlink fails? 
ERROR: 
The Free Size is : 2.5 GB
failed on .:
failed on ..:
Use of uninitialized value in numeric gt (>) at diskspace.pl line 24.
failed on file1.txt: No such file or directory

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What output do you get if you change the unlink to: 
## $^E is the extended system error message
unlink $file or warn "failed on $file: $^E\n"
            if -M $file > 14;

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ERROR:

The Free Size is : 2.5 GB
failed on .: Access is denied
failed on ..: The system cannot find the file specified
Use of uninitialized value in numeric gt (>) at diskspace.pl line 24.
failed on file1.txt: The system cannot find the file specified

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In reply to Re^2: remove files from the V volume on windows by fnicholas
in thread remove files from the V volume on windows server 2008 by fnicholas

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