Some versions of Windows 7 gives an option to create an image of your hard disc. You will find it here:-
START>All Programs>Maintenance>Backup & Restore
On the LH side is an option "Create a System Image" which you should select and a new window appears and a search starts looking for a backup device.
If you take a system Image just after setting up your PC/laptop then you can always restore your machine back to that point.