Why did my install all of a sudden get really slow?

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http://askubuntu.com – It is just running really sluggish, and slow... Kinda reminds me of when I work on Windows computers that are full of Virii.. Any ideas or suggestions? Let me know if you need any more information. Also, my computer usually runs pretty fast, I have Linux Mint, and Windows installed on the same PC and they run fine... (HowTos)