want to go from 32 bit to 64 bit need some guidance

Thanks for all the Help Greg. I have been planning on doing some upgrading so I will look into some ram. Maybe a cpu later. This one will eventually become my kids school computer next year so got to make sure it stays up and running and then I will build me a video editing monster next year.
 

My Computer My Computer

At a glance

Windows 7 Ultimate Service Pack 1 (build 7601...3.20 gigahertz Intel Pentium D4 gbNVIDIA GeForce 9500 GT
Computer Manufacturer/Model Number
custom built
OS
Windows 7 Ultimate Service Pack 1 (build 7601) 32bit
CPU
3.20 gigahertz Intel Pentium D
Motherboard
Gigabyte Technology Co., L
Memory
4 gb
Graphics Card(s)
NVIDIA GeForce 9500 GT
Monitor(s) Displays
Acer AL1716
Hard Drives
WD My Book 1110 2TB, Seagate freeagent 1TB, WDC-500GB
Case
Cooler Master HAF 922
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