some programs that use system files will be better off on the SSD with the OS (like .NET and DirectX I would put on the SSD), Then you can go into the registry, and change the default path for downloads to the next drive (i.e D: instead of C: ). Otherwise by default itll go onto the SSD, you have to change the install path of each program in question (if given the option), or changing the OS registry to default download to the other drive.
Found this on the Microsoft website.
The 64bit version has two versions of regedit. Make this change as well:
This
To change the registry, follow these steps:
1. Start Registry Editor by entering “Regedit” in the search All programs.
2. Locate the following:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
3. Right click on the value named ProgramFilesDir & change the default value C:\Program Files to the path you want to install all your programs in.
4. Click OK and Exit.
PLUS this
1.) Enter into Start>Run: %systemroot%\syswow64\regedit
2.) Go to: HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion
3.) Change the Path in DWORDs ProgramFilesDir, ProgramFilesDir (x86) to the new path, probably just changing the drive letter.