Well, I re-format my laptop (and desktop) 2-3 times a year. But I have been told I am very, very anal when it comes to things like this. I find, personally that it helps speed the computer up significantly, but you must be prepared to understand and learn how to do it.
You can definitely "re-format" your entire laptop hard drive with absolute ease you have the following backup considerations in place:
1. You have a copy, or versions of all your software (Firefox, Outlook Express, Word, Photo Shop, whatever applications you use );
3. Make sure you have a copy of drivers for the essential functions for your laptop, such as "Video" driver, "Audio" driver etc
2. You can create a copy of all your files, emails and other information you want to keep;
and..
3. You have a copy/original version of your operating system (in your case Win XP).
Now...., I ensure I have all three of the above steps, so here is my step-by-step procedure....
1. I ensure I have confidently backed up my files, emails, and all important files onto either a burned disc or a back-up drive.
2. Confirm you have these files!!!!!.... Make sure all your documents exist on a separate medium to the laptop. (I lost 500 images of my daughter because I didn't check to see if I have made a backup prior to re-formatting the Hard disc)
3. Make sure you also have reliable copies of the applications you are using. Often with programs like Microsoft Explorer and Firefox, you can download free from the internet anyway.
4. Insert your disc containing Windows XP and go through the "re-installation" procedure. When you are prompted to either repair or install a new installation of Windows XP, choose "New Installation".
5. During this procedure, you will be asked to format the hard drive.....
6. Windows will be installed...
7. You will need to install the multimedia drivers to get the sound and best video working
.
8. Install your common software applications.
9. Install your files and emails....
That sounds all easy. I know it will be a difficult learning curve.
Struth, I hope all that makes sense....