Conversions sometimes fail no matter how careful you are preparing the server. The failure can occur at various stages in the conversion process; these stages are based on the task bar percent and are estimated values.
1. Creation of the target virtual machine (VM) (0%-5%)
2. Preparing to Clone the Disk (5%-6%)
3. Cloning (6%-95%)
4. Post-cloning (95%-97%)
5. Customization/Reconfiguration (97%-99%)
6. Install Tools/Power On (99%-100%)
Converter creates a detailed log file during the conversion process which will contain exact errors pertaining to why the conversion failed. This log file is located on the server you are converting that is running the Converter agent, and is usually named vmware-converter-0.log and is located in the C:\Windows\temp\vmware-temp directory.