So im a highschool student and there is an opportunity for me to get a varsity letter if I do 145 hours of community service and I was wondering if I could use the time my computer has been computing as a form of community service.

I would guess that since your computer would be doing the work and not you, the answer is likely no. Still, feel free to participate here!

you're probably right but that doesn't stop me from trying the only problem is I would need a letter from the manager or founder.