Having Virtual PC SP1 not running properly with Windows 7 versions 7048 and 7057 can be frustrating, especially when the virtual machine additions are not working as expected. Here are some steps and advice you can follow to troubleshoot and resolve this issue: 1. Compatibility Mode: Try running the Virtual PC software in compatibility mode. Right-click on the Virtual PC executable, go to Properties, and under the Compatibility tab, enable compatibility mode for Windows Vista or an earlier version of Windows. 2. Reinstall Virtual Machine Additions: Sometimes a reinstall of the Virtual Machine Additions can resolve compatibility issues. Uninstall the current additions, restart the virtual machine, and then reinstall them. 3...