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Partition Master 10.1
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The easy way to find out is to check what version of Windows 7 you are running.
Here's what you do:
You'll be presented with a screen like this:
Under the System section you can see a label called "System Type". This tells you whether you're running the 32-bit version of Windows 7 or the 64-bit.
Free partition manager - EaseUS Partition Master Free Edition supports Windows 2000/XP/Vista/Windows 7/8 32-bit & 64-bit system and you can enjoy it like a commercial partition magic alternative. Check edition comparison of EaseUS Partition Master.