In fact, virtual machines are often used to test software in different environments, or test Web sites and Web applications with different browser versions. It's awesome, and if you're looking for a Duke Nukem fix this is the place to be (see ).
Looking for a way to play old DOS-based games under Windows 7? In Windows 7, the Windows Virtual PC virtualized environment—shown in Figure 3-12—plays a special role.
Previously, this environment was made available as a standalone application to users of various Windows versions.
With Windows Virtual PC, however, this product is now a Windows 7 feature.
Make sure you download the correct version for your PC.
Secret: Windows Virtual PC has specific hardware requirements, and thanks to the vagaries of microprocessor marketing, your PC may not be up to snuff.
Learn where MSPs should get started, explore the evolving hosted virtual desktop market, and find out what kind of customers could benefit from Daa S.
Figure 3-11: It's crazy but it's true: Windows XP and Windows 7 applications can now run side by side.
Whether you’ve replaced your hard disk with a big chunky SATA one or decided to downgrade to XP from Windows Shitsa (eh, of course I mean Vista) then it’s likely you’ll come across an issue where you are either prompted by Windows XP setup for a floppy disk containing a driver or setup simply bombs out with a blue screen of death (BSOD).For the remainder of Intel's modern CPU lineup, however, you can refer to Tables 3-1 and 3-2.Table 3-1: Intel Desktop Microprocessor Support for Hardware-Assisted Virtualization If the PC you're using does not include a microprocessor that supports hardware-assisted virtualization, you have two options: you can use a different PC, of course.And with AMD it's simply called AMD Virtualization (AMD-V).The vast majority of modern (for example, 64-bit and multicore) AMD processors include AMD-V, so you're generally in good shape if you're running a PC with an AMD processor.And though it doesn't ship on the disc with Windows 7, it can only be installed on Windows 7.Understanding Windows Virtual PC To the operating system and applications running in a virtual environment like Windows Virtual PC, the virtual machine appears to be a real PC, with its own hardware resources and attributes.Figure 3-12: Here, you can see Windows XP running inside Windows Virtual PC on top of Windows 7.That said, for the best results, anyone utilizing Virtual PC to run an older operating system such as Windows XP along with whatever set of Windows 7–incompatible applications is well served to pack the host PC with as much RAM as physically possible.That old Pentium 3 with 256MB of RAM just isn't going to cut it.Secret: Windows Virtual PC is available in separate 32-bit and 64-bit versions.