Buying New Computer NEED HELP!

I have always been a mac user so I don't know too much about PC's and would love if someone could help me out. I am looking to purchase a powerful desktop PC in order to run multiple accounts on a couple of social media bots. The laptop I have right now is doing the trick for now but after running the bots for a few days I keep getting a "fatal error: out of memory", and also the bots seem to have hiccups every few days where they stop connecting and I have to reset everything, which I assume is because of the lack of RAM in my laptop. Anyways, I am looking to buy a much stronger desktop PC but I don't know where to start. Does anyone have any suggestions on PC's that I can run hundreds of accounts on without having too much trouble?

Thanks in advance!

If you have some money try to look for spec like: Intel i5/i7 +2nd gen CPU, 16GB of RAM and SSD(SATA does the job as well). Do not really think you need a decent GPU. Local guys will charge a bit more, so try to look for a deals on ebay at first. If you need PC just for running bots VPS may be a better solution

EDIT: double post by mistake