To resolve this, you generally need to update the "Burn Routines" rather than downloading a single DLL file from a third-party site. :
C:\Program Files (x86)\Sony\Vegas Pro\<version number>\ (After Sony sold to MAGIX, paths changed but legacy installs remain.) dllav32.dll version 6.1.124 magix download
Security software occasionally flags custom multimedia DLL files as potential threats and quarantines them. To resolve this, you generally need to update
[MAGIX Software UI] ---> [DVDMaker.dll] ---> [DLLAV32.dll (Version 6.1.124+)] ---> [Physical Disc Burner Drive] To resolve this
After placing the file, open an elevated Command Prompt and run: regsvr32 "full\path\to\dllav32.dll" (Note: Not all MAGIX DLLs are registerable; this step is often unnecessary but safe to try.)