On all the cases where I've gone from a functioning HDD install to an Acronis image capture and then clone build onto a SSD I have not triggered a need to reactivate the W7 install or re-enter software activation codes. Those all come over in the clone process.
There may be a few drivers that get auto-installed from the hidden W7 driver archive built into the OS install. I have not needed to download any drivers from the net for this type of transition.
I do recommend doing Disk Cleanup monthly from C:\ Properties\ General tab, including its "More options" System Restore and Shadow Copies cleanup. This can take a while the first time. Then also to to the Tools tab and check both boxes for Error-checking and restart. Do that also monthly, and a general rule. I'd do that on the HDD before you capture its image, and also do both shortly after you get the SSD installed, in that order each time you do that.
