It is not a pick and choose sort of deal, its all or nothing.
Even if there was a way to move all the OS and not the programs, the programs will not work. When a program installs it installs more then just what is in the program folder, it installs registry keys, files in user accounts, and/or files in programdata folder; once you move the location of these things to a different drive letter, it will no longer work.
I take it you are in the situation where you have a 120 GB SSD and a hard drive with say 600GB of data on it, am I correct?
You may be able to modify partitions so that you can move the files off of your OS drive C and then clone that to your SSD.
How much free space is on your 1TB drive, and how much of that is files vs programs??