If you don’t know Sysinternals you are in trouble. Sysinternals provide a bunch of small yet
very useful applications. One such example is ‘Process Monitor’- if you need to find which
process is locking/accessing a file it is perfect.
Sysinternals was acquired by Microsoft in July 2006,this is their new website:
http://www.microsoft.com/technet/sysinternals/default.mspx