optimus c how to restore system

[chaosincxz]

I have a optimus c I rooted awhile back I was a newbee but under stood how etc.I think I could've accidently deleted some imporant files phone stoped working no 3g signal n It flashes app android keyborad (process.com android .imputmethod.latin has stopped I'm guessin that's keyborad well I factory reset yea that didn't fix mad worse a lot files n stuff gone is there way to restore phone via computer ??? I done swichd phone carriers new phone just wanna see if I could fix tje optimus