That problem is fundamental to how Linux and Windows deal with a bad situation.

Back when the love letter crisis was ungoing I had a Linux machine fill the disk with log messages and deleting /var/log/messages didn't free the space because there still was a process that had the file open.

In a similar situation in Windows you can't delete the file. Either way it is a problem like looking at Cthulhu and something bad is going to happen either way you resolve the situation.