Heres a loaded question...

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I need some help. My computer is slow and Im not sure what to do. I would like to know what can cause a computer to run slow and how to improve its performance and speed. I also would like to know what programs out there are really good to have. Is a registry cleaner really necessary and if so, which is best (and free, if possible- Im on a tight budget, I know, who isnt), do you really need malware/spyware protection or is an antivirus protection sufficient? Which is a really good antivirus or internet security program (preferrably free if possible) that doesnt slow ur pc down (mine is slow enough) and doesnt take up a lot of space? I had in the past AVG, but I got a virus with it so I took it out, then got Avast, no problems there, but wanted to try something new so I got Norton (it crashed a few times and yes, a huge source hog) and I liked it a lot, but was just too big to keep, so now Im back with Avast. If I have Avast, do I really need extra malware/spyware protection? Im trying to keep the programs installed down to a minimum to avoid too much space being used. So Im looking for free programs that are really good basically, and I dont want unnecessary programs installed, cluttering up space, but I want something good that will stop viruses/malware/spyware and get my pc running great. Please help. Thanks.