So how good is my PC
7/10 a decent computer that is 2/3x better than my computer, windows 7 64 bit is really good, your cpu is GREAT, 4 CPUs is really good but the speed is kinda low only 2.3 GHz, I used to have a 3.00 Ghz dual core CPU, but its still good nonetheless. 4GB of ram is awesome, I only have 2GB of ram. Your graphics card isn't the latest and best thing out there but its WAY better than most intergrated graphic cards people get nowadays, 1902 MB is really good! It should run most games from medium to high settings and it should run most new graphic heavy games from low to almost medium settings.
Now do me! 
4.5/10 windows 7 64 bit is really good, the cpu is not good, its only 1 CPU with 1.7 GHZ, I have a better CPU than you. The ram is as good as mine but the graphics card isn't that great, its a intergrated graphics card, don't expect your PC to run most new games on great settings. It should run most games from low to medium settings and it should run most new graphic heavy games at minuium to low settings.