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The first OS put out by Microsoft. The OS is 16 bit.
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Window 2.0 is the 2nd OS released by Microsoft that made significant improvements from there first OS windows 1.0. The OS is 16 bit.
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Windows 3.0 is the 3rd windows OS and had a 32 bit version. It is the first OS by Microsoft that competed with apple.
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Windows for Workgroups 3.11 is the 4th windows OS and is 32 bit.
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The 5th windows OS. It is a 32 bit OS.
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Windows NT Workstation 3.5 is the 6th windows OS. It is a 32 bit OS.
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Windows NT Workstation 3.51 is the 7th windows OS and is a 32 bit OS.
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Windows 95 is the 8th windows OS and is 32 bit.
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Windows NT Workstation 4.0 is the 9th windows OS and is 32 bit.
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Windows 98 was the 10th windows OS and is 32 bit.
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Windows 98 Second Edition is the 11th windows OS and is 32 bit.
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Windows 2000 Professional is the 12th windows OS and is 32 bit.
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Windows Me is the 13th OS and is 32 bit.
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Windows XP is the 14th windows OS and has a 32 and 64 bit versions.
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Windows Vista is the 15th windows OS which has a 32 and 64 bit version.
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Windows 7 is the 16th windows Os and has a 32 and 64 bit version.
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Windows 8 is the 17th windows OS and has a 32 and 64 bit version.