Many SSD manufacturers include a disk cloning application. It will copy your Windows drive (i.e. C: drive) to the SSD, assuming there's enough space on the SSD. Then it's a matter of switching the boot drive as the new SSD and your "old" drive becomes the secondary drive if you want to keep it.
I've successfully done that many times on Samsung, Radeon and Kingston SSD's. There are also free utils you can get to do the same thing.
And if you upgrade your Windows 7 to Windows 10 one day, having the SSD installed will greatly accelerate the process!
Have fun!