In Windows 10 this is a very simple. Just right-click on the start button (the little Windows icon) and choose Device Manager. This will tell you quite a bit, including which processor and graphics card you have and plenty of other information besides.
To find out how much RAM, right-click on the start button again, but choose System. This gives you a summary of the operating system, plus how much RAM is installed.
If you have Windows 8 Just hover over the top right hand corner of your screen to bring up the Charms. Then choose Settings > PC info. This is a shortcut that takes you to Control Panel > System and Security > System.
In Windows XP or Windows 7, you have to work a little harder. Right-click on My Computer and select Properties (in Windows XP, this is called System Properties). Look for System in the Properties window (Computer in XP).
Whichever version of Windows you are using, you’ll now bee able to see your PC- or laptop’s processor, memory and OS.
Processor tells you the speed of your CPU, and the specific processor model. The entry for Memory (RAM) tells you how much RAM you have. More is better, but if you have a 32-bit operating system, you can use only up to 4GB of RAM.
Finally, the entry for System type will tell you what version of Windows you are running. Newer versions of Windows will also tell you if you have a 32-bit (x86) or 64-bit (x64) processor. The latter is far more common.