The main differences between the 32-bit versions of Windows Vista and the 64-bit versions of Windows Vista relate to memory accessibility, memory management, and enhanced security features. The security features that are available in the 64-bit versions of Windows Vista include the following:
1.Kernel Patch Protection
2.Support for hardware-backed Data Execution Protection (DEP)
3.Mandatory driver signing
4.Removal of support for 32-bit drivers
5.Removal of the 16-bit subsystem
By Microsoft Support
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