1. Press the Start-button, go to Control panel and choose System.
2. Under the General sheet you have:
System: Microsoft Windows XP
Professional x64 Edition
Service Pack 3
* If you cannot find x64 edition on the second line, you have a 32-bit operating system.
* Content may be different pending which operating system and language you have, the second line could read Home edition, Professional edition, and others. The important thing is to look for x64 edition, if this is not present then you have 32-bit.
a quick search on google and you would not be called a noob, loser, etc.