For non-Vista systems you can download the Upgrade Advisor to see if your laptop qualifies. To give you a little more detail, to run Windows 7 your laptop must have the following:
A processor rated at 1 Gigahertz or faster
Even if you bought a laptop in 2003, when the first batch of Pentium M processors (codenamed “Banias”) came out, Windows 7 appears to have it covered as well, as long as you have at least 1GB of memory, 16GB of hard drive space, and a DX9 graphics card.
1GB of RAM #2GB for 64-bit Windows 7#
More memory doesn’t hurt either, especially with older laptops that ship with 512MB. Memory modules are inexpensive, easily accessible, and can mean the difference between a clunker and Windows 7 bliss.
At least 16GB of storage space (20GB for 64-bit Windows 7)
A DX9-compatible graphics card, with the WDDM 1.0 driver
A laptop with an ATI or nVidia chipset is a really good sign that it’ll run Windows 7, but make sure you have the latest graphics driver handy. Windows 7 has native driver support for legacy nVidia and ATI cards. Updated drivers are just a precautionary step.
Even laptops going back 5 or 6 years can run Windows 7, and simple hardware upgrades can be made to ensure an optimal user experience. If your laptop can’t run Windows 7, it probably belongs in a museum.
Can Your Laptop Run Windows 7? – Reviews by PC Magazine
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