Need advice on best upgrades for my prebuilt pc

[Mysterio415]

I have a HP p2-1394 that I got a while back and its starting to slow down. It's completly stock (Havent even opened it) I dont have the money for a completly new build so I'd like some advice on the best way to upgrade it with ~200 dollars. Im pretty sure a new motherboard and psu is a given. I'm not sure if there is any hope or if this is pointless ambition. Any advice would be appreciated.

 

[BadActor]

I don't think investing any money in the PC is a good idea. Aside from potential issues caused by proprietary parts and that you will need a new OS, the hardware is rather dated. Better to think of the money you would have spent on upgrades as a discount on a new build. You can begin purchasing parts as finances allow. $200.00 can easily get the CPU, motherboard and RAM, plus you can re use the HDD. This would leave you with needing the case, , GPU, PSU and OS.

A decent budget office/mid level gaming rig would look something like this:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($194.99 @ SuperBiiz)
Motherboard: Gigabyte GA-H110M-A Micro ATX LGA1151 Motherboard ($50.99 @ Micro Center)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2133 Memory ($30.69 @ Newegg)
Video Card: EVGA GeForce GTX 960 2GB SuperSC ACX 2.0+ Video Card ($169.99 @ NCIX US)
Case: Corsair SPEC-01 RED ATX Mid Tower Case ($39.99 @ Micro Center)
Power Supply: SeaSonic 520W 80+ Bronze Certified Fully-Modular ATX Power Supply ($62.99 @ SuperBiiz)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($85.49 @ OutletPC)
Total: $635.13
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-04-24 17:55 EDT-0400

Save the GPU for last, the HD 530 graphics are capable of light gaming and new cards are soon to be released.