I have a MacBook Pro (late 2006) and suspect a Motherboard failure. I changed the internal HD but it will not install the OS or the TM backup and it crashes.

Now, I have a Time Machine backup on an external HD with my latest data and would like to know if I can set-up an other user on my IMac and use the Time Machine back up to get some files (prefs in applications, emails, etc.). I can open some files located inside Time Machine but would like to run some applications...?