Thanks FD, ResetBase didn't work: "StartComponentCleanup option not recgnised in this context"
and "the SpSuperseded" didn't work either "no service pack backup files found" (I think my install disk was Win 7 SP 1).
My winsxs is 10gb. Now that SSD prices are coming down, I'd definitely go for a 256gb one for my C drive.
I reclaimed a bit more space by locking down the swap file to 8gb-8gb. It was "automatically" using 14gb (even with 12gb of RAM).