I want to change the default install location for my programs....the ones that do not give me the option during install to manually change them...
This is possible, but I'd suggest you don't change this setting.
First off, how many programs that don't allow you to chose their install directory are big enough to matter?
If you really are worried about space on your main drive there are two better options.
1. Try compressing the application's folder using NTFS compression. Programs usually compress well and the fragmentation that compression often causes is pretty much irrelevant on an SSD. In many cases this can make things faster as fewer bits need to be read from the media.
2. If you are really short of space, install the program as normal, then move it to another drive and make a symlink in the original location. This leaves a pointer in your program files directory that points to the real location. There are command line tools for this included in Win 7 (mklink), or you can use this for a nice GUI: http://schinagl.priv.at/nt/hardlinkshel ... nsion.html