Have a look at the brand of the two drives involved. Usually one or both brands will offer the use of some sort of disk partitioning/cloning/setup/data migration software and through this, you should be able to clone the contents of your 'old' drive to the SSD as has been mentioned above. The limitation being the size of the drives of course. If your old drive has more data on it than the SSD can hold, you'll need to bring this down first.
I have used Acronis True Image for this in the past (Western Digital is one brand that supplies this), but other packages will offer the same options I'm sure.