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#11
That is a lot of stuff, I would recommend(My Opinion, your choice) to back up any files you need. Make sure you have the key for your MS office. Then I would do a clean install.
If you don't want to clean install, the only Dell software to keep would be the quickset. Try removing the Dell stuff, minus quickset, and see if it improves for you.
If you don't use any Apple products, get rid of it too.