Games taking a lot of time to launch

[AxelAxel1234]

when i launch games (steam games like dota, pes18, pubg, or just other non steam games) it is just show black screen for more than 1 min and sometimes just not working (even the game is only 150 mb). Cant use windows button to go to desktop but ctrl alt del still working fine. Task manager show that the game is not not responding.
my games located on hdd (still got 400 gb free). I've tried to defrag and disable antivirus but still nothing. im using i7 7700k, gtx 780
any ideas? thanks!

update : restart make it back to normal but later this happened again

 

[rgd1101]

What the disk usage? check disk health?

 

[AxelAxel1234]

What the disk usage? check disk health?

where to check disk health? disk usage never more than 30%

and sometime restart make it back to normal

 

[rgd1101]

ram usage? running anti virus/malware?

 

[AxelAxel1234]

ram usage? running anti virus/malware?

nothing more than 20% except cpu usage about 30%. Im using avast but when I disable them it is still the same