My computer is constantly stuttering

Hi everyone i'm new to this for but my computer is making me take some time to find some real help for it. About a few months ago, My computer started getting a really bad habit of making everything on my computer have a 1 sec delay. I would move my mouse and it would freeze for 1 sec and then proceed to move the mouse and i would try to move it towards my target destination but not before it would lag again. I've notice that it gets especially bad when i load up a game(League of legends especially). i'm not sure what to do at this point seeing as i have tried mainly everything.( scanning my computer, scanning registry, uninstalling league of legends). If anyone could help with this situation i would appreciate it as i'm getting worried.

My Specs.

Windows 7 64 bit
Evga Gtx 570
Intel i7-2600k
MSI P67A-C43
Rosewill 650W PSU

What kind of readings are you getting for your psu?

What hdd is your information on and are you running windows in low power mode?

What antivirus program are you using?

@linkedkube
I'm sorry but how would i check for that information

@tmagic650
I am running Eset antivirus

Rosewills power supplies are not the best. You might swap it out and see if your computer runs better

Yeah i've been thing if thats the problem but an new PSU is gonna have to happen later