System requirements for Windows Virtual PC
Before you move on to Windows XP mode in your Windows 7 have a check @ your system requirements as well.You must have following configuration :
*Hardware Virtualization Technology enabled
*1 GHz 32-bit / 64-bit processor required
*Memory (RAM) :2GB memory or higher recommended
*Recommended 15 GB hard disk space per virtual Windows environment
*Supported host operating system: Windows 7
*Supported guest operating system: Windows XP SP3 / Vista / Windows 7