Hi and welcome to Computer Hope!
If you want to run Windows 7 on your PC, here's what it takes:
-1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
-1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
-16 GB available hard disk space (32-bit) or 20 GB (64-bit)
-DirectX 9 graphics device with WDDM 1.0 or higher driver
source:
http://windows.microsoft.com/en-US/windows7/products/system-requirementsWhat is your processor? And what is the speed of your processor?
A 1gb RAM for Windows 7 is just a standard, so if you want make it better, upgrade your RAM