They there,
Stu7!
You can move your OS with a cloning or a migration software. Most SSDs come with a migration utility as
Paul NZ mentioned.
If you prefer cloning, you will find various software apps that can do that for you online, I personally like Acronis True Image.
http://www.acronis.com/en-us/
The software will give you the option to select manually what gets cloned and what doesn't.
If you have the OS installation DVD/CD though, I'd recommend a fresh install on the SSD because it will prevent the transfer of all the redundant, temp and dump files from your old OS.
Cloning/migrating may be a much faster solution when installing a new HDD, but it's not as highly recommended as the clean install.
Hope this helped! Good luck!
SuperSoph_WD