It is easy to take an image backup of your PC in Windows 7 which you can use to restore your entire system. All you need is a removable hard drive (you can also backup to DVD and network but a hard drive is much easier) and then to follow these steps;
1. Press start and then in the search box type in backup
2. Select Backup and Restore
3. Plug in your hard drive and then select Create System Image
4. In the next windows select your hard drive and choose next and then run the backup
5. The process should take 5 – 30 minutes depending on the size of your PCs disks
6. Once complete you will be prompted to create a System Repair Disc which is needed if you ever need to restore from that image backup