There's going to be a lot of stuff installed on your C: drive whether you want it there or not.
 
The installation program asks you when you want to put things, which is nice since I always want to put things anywhere but on the C: drive, but then it goes and puts a bunch of stuff on C: anyway (I hate it when programs do that).
 
Just Studio Instruments is 1.2 GB under Program Files x86 and Native instruments put 130mb or so of stuff un Program Files and Propeller Head put some stuff there as well.
 
So if you don't have at least 1.3GB of free space on C: you might have a problem. (funny how 1.3gb doesn't sound like very much anymore...)
 

At least you can relocate the Studio Instruments content after installation to free up some space http://forum.cakewalk.com...673527&mpage=1#2673527

changed my temp folders to my music drive, installation is progressing. Then I guess I will have to move all the other stupid files that should be going to my music drive anyway. It's kind of funny, having a hard drive setup just for music is basic stuff, and yet cakewalk still makes things difficult. Anyway, thanks for the help guys, maybe some day Cakewalk will get their act together and this won't be necessary...