Will I be able to reinstall my apps from external hard drive if I clear my boot drive?

I've been having some problems with my computer. I'm going to clear the hard drive, and do a clean install of Snow Leopard. I have all my apps and documents backed up with Time Machine. Things like Chrome and OpenOffice, I can always just download again, but what about stuff Photoshop Elements 9? Is there a way to deauthorize it now, so I can put it on when I reinstall? Also, I've bought a few things off the Mac App Store, like Asphalt 6 and Color Schemer Studio. Can I transfer those purchases? And one last question. Right now, If I make a new user (administrator), and try to go to Time Machine's backed up files, it says I don't have permission to access them. So do I have to make a copy of those somewhere else on the extermal hard drive?
Thanks!

D. Shamburger wrote:
I'm going to clear the hard drive
That may be the nuclear option. You don't specify what kind of problems, but erasing everything and reinstalling piecemeal is rarely required on OSX.
If you think your installation of OSX is compromised, have you considered just installing a fresh version of OSX, without disturbing anything else?
I have all my apps and documents backed up with Time Machine.
Many apps cannot be restored individually.  Those that came with installers usually install other files in other places, so if you only restore the app, it won't  work properly, if at all. See Transferring  Applications.
Right now, If I make a new user (administrator), and try to go to Time Machine's backed up files, it says I don't have permission to access them
One user, even an Admin user, doesn't normally have access to a different user's files, and Time Machine enforces that on its backups.  To restore things from a home folder selectively, you need to be logged-on as the user that was backed-up. 
If you do a full system restore, or use Setup Assistant or Migration Assistant, you can restore another user's stuff, but it all goes to that user's account.

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