Mr.JBT

Yeah I just got the fans in and tryed Cinebench and Prime95 and the temps didn't go above 70C

That system is at least 15 years old, what exactly do you plan to do with it?

get OS from reddit for $20-30.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i3-6100 3.7GHz Dual-Core Processor  ($110.99 @ SuperBiiz) 
Motherboard: Asus H110M-A Micro ATX LGA1151 Motherboard  ($49.99 @ Newegg) 
Memory: Avexir Core Series 8GB (1 x 8GB) DDR4-2400 Memory  ($30.99 @ Newegg) 
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  ($47.49 @ OutletPC) 
Video Card: Asus Radeon R9 380 4GB Video Card  ($174.99 @ Newegg) 
Case: BitFenix Nova ATX Mid Tower Case  ($26.99 @ NCIX US) 
Power Supply: EVGA 450W 80+ Bronze Certified ATX Power Supply  ($35.98 @ Newegg) 
Total: $477.42
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-26 06:28 EDT-0400

Minecraft does work on windows 10 

Minecraft works just fine on Windows 10 without any issues. 
 
Also, you do not need a sound card, especially if you're on a budget. The motherboard sound should do just fine.
 
If $500 is your budget, then you're going to want to go AMD. You're not going to get a new quad-core Intel CPU to fit in this budget easily (without going over by about $70 or foregoing a discrete graphics card), though you can get a dual-core Intel CPU like an i3 or Pentium. You may also want to consider the used market - getting everything new is expensive, though be careful if you do get used stuff.

THE PROPER MINECRAFT DOES WORK ON WINDOWS 10. 

Very off topic, is gum actually illegal where you live?

just the sale of it, you'll need a perscription to get it here(medicinal gum only). very hard to get gum that isn't from overseas so its almost like an actual ban.

you can blame the idiots taping their used gum on the train doors and spitting it on the floors for the ban