windows backup is ok for backing up a few files etc.
my advice is to make a complete image of your hard drive to another drive such as your removable hard drive or cdr dvd etc. with something like acronis or drive image. you wont regret it, this comes in really handy if it all goes pear shaped on you.
instead of having to re install windows and then update it again and then install all your software and back ups again, you can be up and running with a fully updated operating system and with all your essential software installed in under half an hour in most cases if you keep the images up to date. well worth it.
click here click here