Hello there ! 
I recently buyed a new PC
Intel Core i5-4690K + Corsair H100i cooler
MSI GTX 970 GAMING 4G
MSI Z97 GAMING 5
Kingston 8GB DDR3 1866MHz -CL10 HyperX Fury Blue Series
Corsair 750RM
and I use my old HDD Western Digital Green ( I got it in 2010 )
I got a problem, when I'm playing or I'm in Windows everything gets laggy, like if I open 5 windows at the same time baam it freezes. I really don't now what could be the problem so I checked my HDD with HD TUNE PRO here are the results :
Thank you for you time and help

I recently buyed a new PC
Intel Core i5-4690K + Corsair H100i cooler
MSI GTX 970 GAMING 4G
MSI Z97 GAMING 5
Kingston 8GB DDR3 1866MHz -CL10 HyperX Fury Blue Series
Corsair 750RM
and I use my old HDD Western Digital Green ( I got it in 2010 )
I got a problem, when I'm playing or I'm in Windows everything gets laggy, like if I open 5 windows at the same time baam it freezes. I really don't now what could be the problem so I checked my HDD with HD TUNE PRO here are the results :



Thank you for you time and help
