My custom build PC is suddenly very slow. Help would be appreciated.

[ergoincomplete]

My custom build gaming PC has been running very slow since last Monday. Completely out of the blue. I've looked around on threads to find a solution but everything I tried has been futile so far. This includes reinstalling drivers, running anti-virus/malware software (including Malwarebyte), reinstalling RAM and running CCleaner. It takes a very long time to run even the simplest of programs. It takes more than 30 mins to even start Steam. Chrome just decides it does not want to connect to the internet because it takes too long to load. PC works fine in safe mode and temps are normal, around 30 celsius.

My Specs
Motherboard: MSI Z97 GAMING 5 Card
Graphics Card: Nvidia GTX 970
Cooler: CooMas HyperTX 3 Evo
Processor: i5-4690K
Power Supply: Corsair CS650M 650 watt ATX24
RAM: 8gbs

I've had this setup for a month. I use windows 7.

If you need anymore information, just ask. Help would be really appreciated.
Thanks in advance!

 

[ergoincomplete]

Thanks so much for the help guys! Got my new hard drive today and my pc works like a charm again Once again, thank you.

 

[ohiou_grad_2006]

No problem. Next upgrade ssd. I just got a refurbished 256 corsair neutron at microcenter for 89.99. Added the 2 year replacement so if i have trouble, back it goes.