budget pc for $500

Solution
Here you go, dont know if you wanted winows 7 or 8 so I built with 7

PCPartPicker part list
CPU: AMD FX-4300 3.8GHz Quad-Core Processor ($100.00 @ NCIX US)
Motherboard: Asus M5A78L-M LX PLUS Micro ATX AM3+ Motherboard ($50.79 @ Amazon)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($67.50 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Newegg)
Case: Rosewill CHALLENGER ATX Mid Tower Case ($44.64 @ Amazon)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)...
Here you go, dont know if you wanted winows 7 or 8 so I built with 7

PCPartPicker part list
CPU: AMD FX-4300 3.8GHz Quad-Core Processor ($100.00 @ NCIX US)
Motherboard: Asus M5A78L-M LX PLUS Micro ATX AM3+ Motherboard ($50.79 @ Amazon)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($67.50 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Newegg)
Case: Rosewill CHALLENGER ATX Mid Tower Case ($44.64 @ Amazon)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($84.99 @ NCIX US)

Total: $462.89 (Prices include shipping, taxes, and discounts when available.) (Generated by PCPartPicker 2014-03-31 14:56 EDT-0400)
 
Solution