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I'm trying to install Windows 7 x86 and x64 as well as Windows 8 x86 and x64 on a laptop, however, after installing the first three, it will not allow a forth primary partition to be created. When I installed Windows 7 x86 first, it created a system partition of 100MB as well as the primary partition. I then installed Win7 x64 and Win8 x86 each on their own primary partition.

I need to have all four installed for testing purposes and VMs will not suffice. I thought that 4 primary partitions could be created with MBR, however, there are only three listed as well as the 100MB system partition. Am I missing something?

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Windows 7 doesn't need that 100MB partition. It is for encryption. You can create normal partition with the OS only. Then you'll have 4 OS. Regards Adam.

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Convert your disk from MBR layout to GUID partition table partition style.

According to this article on msdn.microsoft.com you can have 128 primary partitions on disk with GPT partitions.

It can be done with windows disk management.

Windows help link:

Change a Master Boot Record Disk into a GUID Partition Table Disk

(there are two ways, command line and windows interface).

Note: Windows XP and older versions have no GUID partition support.

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