I use CCleaner on all of my Windows PC's. It does a great job of keeping all caches and the registry clean. I forgot to mention that those 2 issues could slow a pc down significantly over time - caches especially, but also the registry because after each Windows update it leaves a plethora of leftover junk in the registry. CCleaner also offers the ability to disable/delete startup items. I highly recommend this program to anyone running Windows machines. The free version works just as effectively as the paid version does.
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