Two XP problems

Okey firstly:
My hard-drive which is 9GB is sectioned into two partitions, C: and D:. C: is where XP and DOS are installed two, and D: is where programs go. However when installing programs the default directory will always be the C: and I want it to be D:. Please can someone direct me to solving this issue.
Second problem (less difficult):
I'm using a microsoft natural keyboard pro. However my @ and " keys have been switched around with each other and I cannot resolve the issue :confused:

EDIT: I'm using Windows Pro.

Cheers,
Retro_kid.

For the keyboard problem, go to Control Panel>Regional and Language Options>Languages tab>Details button and make sure the keyboard layout (through the "Add" button) is set to "Dvorak" and the language is the version of English you use (assuming you use English as your primary language, of course ;) )

Thanks for the quick reply! :)