I need to do more than just disk cleanup and defrag, but I don’t want to reformat if I can help it.

Lately like over the last week I feel my computer is getting very slow has several prolems.
This is a list of some problems
1. Unable to turn off computer(fixed)
2. My CPU constantly warming up.
3. Either unable to open email or very slow (my family usee aol and i use yahoo both has this problem on this same computer we share).
4. Similar sites all of a sudden becomes very slow and some are fast.
such as yahoo.com takes a sec.mail.yahoo.com takes forever.

Is there a way to get it to move faster or is it time for me to get a new computer?

Also I have a dell desktop and has had it for 1 and a half year.
Another problem is I am trying to download a aprox 4 mb document where it is taking over 15 minutes and at most it supposively should be taking less than 3 mins normally. The internet speed i have is verizon high speed.
Sorry but I am not so good with the computer.
What is a clache, clipboard and defrag?

Am I all set for a reformat?

Hey everyone. I plan on doing a reformat, but before I get started with that, I am going to put everything I want on to an external hard drive for later retrieval.
(The reason I am doing this is because my computer is getting really slow with loading files, the registry is a mess even though I use CCleaner, Defrag, and virus softwares like norton, malwarebytes.. etc.. and my computer is 7 years old now…)
After I got all my songs, pictures, movies, and whatever else on my external hard drive, I am going to reformat. My computer came with the following CD’s

-Microsoft Works Suite 2003 (Disc 1-5)
-APPLICATION For Reinstalling Dell Tools System Software
-APPLICATION For Installing/Reinstalling Roxio Easy CD Creator 5.2 Basic
-Drivers And Utilities Dell Dimension Resource CD (Contains drives, diagnostics and utilities and computer documentation.)
-OPERATING SYSTEM Reinstallation CD for XP Home Edition SP 1.
-Sound Blaster Live!
-Norton Antivirus
Ahh thanks for reminding me to backup favorites!

I have a laptop and a desktop PC (vista and XP respectively). In the past 1 – 2 months, they both seem to run significantly slower. In particular, surfing the internet is very slow; loading pages can take minutes or not load at all. Reloading a page sometimes helps. This occurs regardless of the browser used ( I have used IE, firefox and chrome, all with the same result).

I have done the following and nothing has helped:
– run a registry cleaner
– run AVG and Adaware anti-virus and anti-malware programs
– cleaned the hard drives and defrag’d them
– ensured I have more than 500 mb space on the "C" drives (I have plenty of space)
– removed non-essential programs from auto start up
– verified the speed of my internet connection

Any suggestions would be appreciated.

Thanks.

How to speed up a slow laptop?

Laptop very slow, have deleted stuff. Carried out a defrag, cleaned registry… help! Windows XP Acer TravelMate 2310