The requested operation cannot be performed on a file with a user mapped section open

I recently started receiving the error “The requested operation cannot be performed on a file with a user mapped section open” while attempting to commit large changes to my subversion repository. My server is a Windows 7 Ultimate installation with VisualSVN, and I never had this issue with my Linux server. After some researching, I found that the issue is the AVG Resident Shield that I have running on the server. Once the Resident Shield was disabled, viola! No more errors.