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Is your Windows 64bit? If you're unsure just go to the top of Steam > click Help > System Information, look at the log and see if Steam is detecting 64bit. Or paste it here we can look together.
How confidant are you with installing Windows, drivers and your software?
You will need to check that your processor is 64bit capable and that there are 64bit drivers available for your hardware.
If you do this you WILL have to BACKUP your data before proceeding as you will lose it.
Using 32/64bit Windows 7 installer you can run an upgrade over your 32bit OS.
With Windows 10 you have to do a fresh install as there is no upgrade path.
Unsure about Windows 8/8.1 but that info is not hard to find.
Edit: and of course I didn't read the OP properly and DudeSau©e™ is on to it.
Its not a Steam issue.
Is your laptop running a 64 bit OS? Or a 32 bit OS? If its 32 bit then Fallout 4 won't run - no 64 bit app will run on a 32 bit system.
Its not even a Fallout 4 issue.
Windows 64 bit can use 8GB to 512GB, depending on what version you have.
Fallout 4 needs a minimum of 8GB
It will actually run on 4, just not great, you do need a 64bit os as the engine was enhanced for 64bit, it will not run on 32bit, it is not directly a memory issue.