OK, this might be where we need your help
I assume you're trying to do a manual install ? (as fara s I can rememeber, the installer doesn't yet have a '2009' option, and in any case the paths are probably wrong if it does).
Previous version of Maya create a folder in your 'users'/'home' folder named something like
Windows: c:\Documents and Settings\username\My Documents\maya\<VERSION>\
Can I ask you to have a look in these locations and let me know what you find?
Alternatively, if you have previously installed custom Maya scripts on your system, where did you put them ?