Create an image file:
First thing to do is creating an image file, the image file is a file created by one of hard drive images creator (such as PowerQuest Drive Image 2002 or 2003, Norton Ghost, GoBack,….etc), it contains an image of the operating system which you're using, all applications that you've installed and all your documents that you've saved on your hard drive. You should save your image file in a DVD-ROM, another hard drive or partition. Usually the Image file is useful when the operating system is not functional or the blue death screen appears at the start up. Instead of formatting your hard drive and install the operating system, reinstall all the applications that were installed and setup your e mail accounts again, all what you have to do is booting from the bootable discs which provide by the drive image creator program, select the image file, and restore your system.
Back up your data:
You can't create an image file every time you create a new document or modify an existing one, since the size of the image file is large, it'll consume more space on your hard drive. The alternate solution is backing up your data. There are many applications that you can use to perform back up such as NTI BackUp Now, or Windows BackUp Utility. By backing up your data, you ensure that your data is safe and up to date.
Clean your registry:
When you uninstall an application, it may leaves some invalid registry keys behind, also when you delete or move a shortcut it leaves an invalid entry in your registry. On the long run those keys become a problem since they'll reduce the system performance. So, using a registry cleaner program (such as Registry Mechanic, Fix it Utility, or Norton Systemworks,….) will help you to get rid of those keys and keep your registry clean.
Use a reliable antivirus program:
It's very important to protect your computer from viruses and worms, they can destroy your data, hardware, and some of them act as spyware to spy on your privacy data such as credit card number, bank account, and email. Using antivirus programs provide you such protection. It's not 100% protection, but it's quite enough. Also it's very important to keep updating the virus patterns of your antivirus program. Updating virus patterns ensures that when your antivirus program performs a scan on your computer, it's looking for the most recent viruses. If your virus patterns are outdated, newer viruses may go undetected.
According to the last antivirus review 2006:
"
http://anti-virus-software-review.toptenreviews.com/?ttreng=1&ttrkey=antivirus+review", the top five antivirus programs are
Bitdefender standard edition, Kaspersky, F-Secure antivirus, PC-Cillin internet security 2006, ESTE Nod32, McAfee antivirus, and Norton antivirus 2006.
Defrag your Hard Drive Regularly:
When using a computer, you create and delete files and folders, install new software, or download files from the Internet. Computers typically save files in the first contiguous free space that is large enough for the file. If a large enough free space is not available, the computer saves as much of the file as possible in the largest available space and then saves the remaining data in the next available free space, and so on. After a large portion of a hard drive's volume has been used for file and folder storage, most of the new files are saved in pieces across the hard drive's volume. When you delete files, the empty spaces left behind fill in randomly as you store new ones. Now, your hard drive volume became fragmented. The more fragmented the hard drive's volume is, the slower the computer's file input/output performance will be. Thus, defragging your hard drive's volume is necessary to restore computer's file input/output performance.
You can defrag your hard drive's volume using windows defragmenter (recommended) or another utility program such as Fix it utility.
You can download and try utilities software at http://www.softarchive.net/