When buying a computer or PC, choose a machine that is powerful enough to do what you need it to do. You do not need a super computer if you are only surfing the net or doing the household accounts. If you need a computer for gaming or more advanced graphic or video work, then you will need more speed and power.
The hard drive of your computer is a big storage area. The bigger the storage, the more stuff you can save on your computer. Typically video and music take up the most room. Storage is measured in gigabytes (GB or gigs). A PC with more than 120GB is sufficient for home use.
Your computers memory is very important. It is also measured in gigabytes (GB). The more memory the faster your computer will perform multiple tasks. The more the better.
This is the brain of your computer. For normal use you will be fine with a 2.5(GHz) Gigahertz chip. If you want to use the computer for gaming, editing video or advanced graphics you may need a powerful processor.
For watching DVD's, editing video or advanced gaming it is worth upgrading to a more powerful graphics card.
A recordable DVD or CD-RW drive is essential for data storage and transfer. Both allow you to back up important documents (700MB on a CD, 4.7GB on a DVD) or backup your hard disk.
Be sure to check your computer has plenty of USB ports for plugging in peripheral devices. Also check for Bluetooth connectivity, webcam, built in microphone and any other additional features which you feel you may need.