Enhance/Improve Home PC Performance

I have my desktop PC that is running really slow due to various downloads and upgrades over the years. I am sure there is a way to optimise it's performance better than it currently is and I am looking for someone who can remotely log into it and see what can be done to enhance and improve its performance and clear out any unneessary applications or malware and stop programs that I don't use from automatically being downloaded and slowing the performance so that I can get a few more years out of it. I have uploaded a document with the specs of my PC in a word document as a FYI. Those who are experts please get in touch. If someone can do this to my satisfaction, I intend to do this annually.