Thanks guys. Anyway NEW INFO:
I thought my problem was solved with the removal of winrar. My computer seemed to be running much better so I thought the problem was fixed. Then the symptoms started again and I realized that the whole time the computer was running slow I had the internet up if not actively then in the background.
It seems to me that the computer is slowed almost to a complete halt when I get online and try to navigate and then the problem stays when I finish navigating if I leave up the webpage even if just in the background, to my best knowledge. Besides the afformentioned winrar I got from my nephew, I run no programs that are illegal or even shareware. I do occasionally download things given to me by friends in e-mail, recipes, freeware (like the antimalware programs) and I have a few reputable booksellers I buy e-books from.
I also recently switched between 3 different web browsers (installing and then uninstalling the two I didn't like, keeping the third). Did I pick up a virus somehow there?
I was able to read an e-book all day with no slowdown but as soon as I got online to read my e-mail I started experiencing the slow down so I posted this and it has taken a while because my computer keeps pausing for 5-30 seconds at a time every few minutes. Incidentally I can use the client server for my online game RuneScape with no slowdown it only happens in the regular browser window but has happened in Opera and Internet Explorer.
EDIT: Thanks for your suggestions regarding my anti-spyware, antivirus. I am thinking of changing from AVG Free to Avira but that is the only thing I will change for now. Hijack this was only installed after this problem became apparent. I will probably delete it after this is fixed and only reinstall if I ever have a problem in the future.
SECOND EDIT: (I had another theory here toward what my problem might be but deleted it when data proved it wrong-edit)
The only things I do on this computer are: Shop for and buy e-books, access my e-mail, browse the web, and play RuneScape which is Java-based so nothing is installed on my computer for it. It runs Windows XP with the latest Service Pack and is almost a year old now. As mentioned above it is a Dell Mini9 Netbook with a 16GB solid state hard drive and 1GB Ram.