Vista - Permissions problewms

I keep running into situations with newly installed programs (for structural
reasons I have my program files folder on a partition labed "P:") When I
install a program I am asked for UAC permission. Once installed, it runs
fine, until I reboot! After rebooting my shortcuts to the newly installed
program are generic and cannot access the program folder. nor can I get to
it witrh explorer. I can go in and manually resedt the permissions to allow
acess, but I don't understand how this is all "supposed" to work.

Can someone point me to documentation that explains the "proper use" in this
situation??

Why does it work initially but not subsequently?

What level of permission should I be setting to which user group and how do
I fugure this out??

Thanks,
Chuck Brotman