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For example, an expanded address space allows Address Space Layout Randomization (ASLR) to better protect against attacks on programs.
Drivers must be signed unless they’re installed in a special boot mode, Kernel Patch Protection prevents applications from patching the Windows kernel in memory on 64-bit versions of Windows, and Data Execution Prevention (DEP) has more restrictive settings on the 64-bit edition.
On Windows 7, the process is similar—just download 64-bit Windows installation media from Microsoft.
Even NVIDIA has stopped working on its 32-bit graphics drivers, so you’ll need a 64-bit operating system to get new graphics drivers for NVIDIA hardware.
64-bit versions also have a number of useful security features that 32-bit versions of Windows just don’t.
Modern demanding games and professional tools can easily use more than 2 GB of RAM.
Given that limitation, it’s no surprise that many applications now require a 64-bit operating system.
If you’re using a 32-bit version of Windows on a 64-bit capable processor, there’s good and bad news.