My Computer Problem - my computer is speed down to a crawl

I told my friend about my computer is speed down to a crawl. How to speed up ?
He said, "The easiest method to 'speed up' a computer is to reformat and reload."
"What really happened to my computer" , I asked him back .

There are many factors that slow down a computer.
i. Maybe your hard drive is just full and has run out of places to put things. How to check hard drive space ?
Look up My Computer icon , double click at it > Right click on Drive C > Select Properties. How much free space you have on Drive C. If less then 20% free space left , you need to do something. Uninstall or remove unnecessary programs that you don't use or deleting files you no longer need. Another option is buy a new and large hard drive.

ii. Too much temporary file and cookies.
Disk clean up process will deleting Downloaded Program File, Temporary Internet File, Recycle Bin, Office Setup Files, Temporary Files, Publisher Temporary Files and Compress Old Files. How to run disk clean up ?
Click on the 'start' > Click 'All Programs' > Click 'Accessories' > 'System Tools' and select 'Disk Clean Up'. Select 'C drive' and click on OK. Check all the boxes and click on OK. It take a few minutes for the computer to search with a list of items to cleanup. The computer will ask you if you are sure you want to perform these steps and you want to go ahead and click on YES. The box will disappear when it finish.

iii. Run Disk Defragmenter.
You need to click on the 'start' menu >All Programs > Accessories > Click on System Tools > Disk Defragmenter. Click on your C Drive > Click the DEFRAGMENT Tab at the bottom left of the box.
I hate this process because it take more than half an hour.

iv. Virus infection.
You will need to open up Antivirus Software that you have installed on your computer. You need to check that your subscription has not expired and that the virus definitions are up to date. After you have determined that your Virus Scanner is up-to-date run a full virus scan.

v. Spyware activities.
Download and install SpyBot Search and Destroy . To run spyware scan must click on "Immunize" to immunize your computer > cllick on "Check for Problems". Let it run for an hour. When finished it will show you a list of infected items in red with check marks. Click on "Fix Selected items" > OK when done.

vi. Maybe Hard Drive Errors.
Double click MY COMPUTER > Right click C drive > select PROPERTIES > Click the TOOLS tab > Select CHECK NOW under the Error-Checking Section > Check both boxes > click OK.
It will show an error message that tells you it can not be run at this time. Click on YES. Shut down and restart your computer. Your hard drive will be scanned for errors when your computer start.

For me let the "expert" take a look at my computer problem. Do it at your own risk !