need help!!!!! with my macbook

ok first off i bought this computer from a friend it worked but it froze up all the time so i was goofing off with it and deleted the extensions folder and files and i have tried everything to restore it to factory is there any way to move trashed items on command +s back to computer bc all i have now is a apple and a loading circle at the bottom i have tried every control and every startup item only ones that work are control +s , control +v, t,n,option and ive tried the disc and flash drive of startup files and everything i think its a virus thats locking me out plus extension files i deleted..... any help would b appreciated ty its a macbook 3 btw i dunno what is running are any of that

 

It's a MacBook 3 that's bout all I know unless u can tell me how to find it with command +s bc that's only way I can do anything with it and it has 3 restart shutdown and sleeps on it is y I said virus but must b male ware any programs that remove on startup and that u can download on startup bc I can't get into this computer no way no how no matter what I been working on this thing 3 days now ty

 

Ok let me look and I'll let u know it's older one it's not thin and it's heavy lol ok I'll see if I can find out

 

https://en.wikipedia.org/wiki/File:MacBook_white.png

--- Post Merged, Jul 2, 2017 ---

http://www.everymac.com/systems/app...2.4-15-early-2008-penryn-specs.html#macspecs2

 

I was reading the info I found on the computer I guess I should have looked it up first sorry bout that is there anything I can try to reformat it any help I have tried everything