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The 4 partition limit only applies to MBR partition tables. Modern computers can use GPT which can contain at least 128 partitions. I don't know what the default for a Windows 7 machine is, though.
– Roland Smith
Commented Sep 2, 2013 at 22:26
@RolandSmith yes, but there is nothing in the question suggesting the OP is using GPT. GPT is still relatively new (I have yet to use it for example) and the symptoms described do sound like it could be an MBR max partition issue.
– terdon
Commented Sep 3, 2013 at 1:14

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