Oh here's a doozy.
The problem here is that you simply cannot copy and paste the files you want over. The default copy operation isn't deep enough and even the elusive robocopy will have a fit. I used it once to see if I could move my Users folder over and it ended up creating a recursive directory so deep that Windows refused to delete it because the pathname is too long (don't ask me how that works).
The only folder you really need to backup if you're concerned about losing your saves and settings is the %APPDATA% folder (type that in the run command) and your Documents folder. You may want to look at the My Games folder as well. All you have to do is copy those out somewhere and just paste it back into your user folder. As far as migrating goes you have only two options.
The first is to install Windows on the SSD and move the folders I mentioned back into your user folder. This is probably the least painful way of doing a migration. Alternatively you could copy the entire user folder and paste it back in. In my experience, anything you can't copy out of say the %APPDATA% folder isn't part of anything important.
The second is to get the C:\ partition size to less than 128GB (probably around 120GB to be safe), get a partition management tool like Partition Magic
, shrink the partition size down appropriately. Follow the first three steps at http://technet.microsoft.com/en-us/libr ... 10%29.aspx
(specifically "Review the current boot configuration (BCD) before changing the system partition", "Use Disk Management console to create a new primary disk partition from unused disk space for the new System partition" and "Mark the new partition as Active" ). Clone the Windows partition over, then finish the rest of the steps in that guide as applicable as possible.