BIOS
· On computers that have an Intel® processor with Trusted Execution Technology (TXT) enabled in the BIOS, you may encounter an error message when starting a virtual machine, stating that hardware assisted virtualization (HAV) is not enabled, even though the HAV setting is actually ON in the BIOS.
o Possible Workaround: Try turning off the TXT setting in the BIOS of the computer.
USB
· When you try to attach a USB device to a virtual machine by using the Attach command on the USB menu, the USB device fail to show up in the virtual machine.
o Workaround: Start Device Manager from the virtual machine [E.g. Click Start->Run>Type devmgmt.msc > Enter]. Expand the ‘Universal Serial Bus controllers’ node. Right click on 'USB Virtualization Bus Driver' and then select 'Update driver'. Provide the path as "%PROGRAMFILES%\Virtual PC Integration Components” and install the driver. Once the update for 'USB Virtualization Bus Driver' is complete, repeat the steps for 'USB Virtualization Hub Driver' under the USB Virtualization node.
· A USB device attached to a virtual machine is removed automatically. This happens if the device reboots or reconfigures itself.
o Workaround: Re-attach the USB device to the virtual machine using the USB menu.
· USB devices attached to computer may not appear in the USB menu of the virtual machine window.
o Workaround: Remove the USB device from the computer. Reconnect the USB device to the computer and try again.
Networking
· Cannot access the internet on the virtual machine when a WWAN device is connected to the virtual machine.
o Workaround: Configure the networking options in virtual machine settings to use Shared Networking (NAT), then connect the WWAN device to the computer and try again (without assigning the device to the virtual machine).
Seamless applications
· Shortcuts to applications that are installed as “per-user” in the virtual machine are not published to the Windows 7 Start menu.
o Workaround: Copy the shortcut to the application that was not published to the “All-Users” menu.
· Removing the Windows Virtual PC update does not remove the links to virtual applications on the Start menu of Windows 7.
o Workaround: These links have to be deleted manually.
· Windows XP Mode feature is designed to help small businesses still using older Windows XP Line of Business (LOB) applications move to Windows 7. A small set of applications, which are graphics or resource intensive such as 3D games or have hardware dependencies, are not suitable for running in Windows XP Mode
Integration features
· It may take a long time to access hard drives connected to the Windows 7 computer from within a virtual machine.
· Sometimes, right-clicking inside a virtual machine starts a file copy on Windows 7 host. This occurs if the clipboard has a large amount of data.
o Workaround: Clear the data from the clipboard. For example, you can copy a small dummy file or text on the Windows 7 host to clear the clipboard.
· The audio from the virtual machine is not audible on the attached audio device. This may occur if the audio device is attached to the computer while the virtual machine is running (in full desktop, or as virtual application).
o Workaround: Close the virtual machine. If virtual applications are running, then close all virtual applications and wait for 5 minutes. Then attach the audio device to the computer, and then start the virtual machine (virtual desktop, or virtual application).
Video/Graphics performance
· Running graphics intensive applications in a virtual machine may result in relatively sluggish performance, especially if the virtual machine is running a version of Windows Vista.