64 Bit software on Windows 7 64 bit runs terribly, but 32 bit software flawlessly

[Rankin McKechnie]

I don't know exactly how to put this, but I'll do my best. One interesting thing I have noticed about my PC is that 64 bit software runs terribly of Windows 7. And ironically, my Win7 copy is 64 bit. Also, 32 bit software runs flawlessly. I have already made a test with 64 bit vs. 32 bit software, one being Minecraft's performance. Minecraft runs terribly on 64 bit java, but runs much faster on 32 bit java. So does much other software I've tested. Could someone explain why my computer's OS behaves like this?

My PC is a Dell Optiplex 745

Full specs:
https://www.dropbox.com/s/78u3d3y6c86s0ms/Untitled.png?dl=0
Also, my computer is DDR2, and I am using a Nvidia GT 630 1GB DDR2 128 bit GPU

 

[ronintexas]

You only have 2GB of RAM - so a 64-bit operating system is a waste of time....

 

[Deleted member 217926]

Yep, 2GB of RAM is making anything slow.