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how to install new operating system in macbook pro

my problem is i tryed to install not knowing 10.6.3 on a macbook pro 10.4.11 and now it shows a white screen. and then was told that I could not jump from a 10.4.11 to 10.6.3

Have you checked Apple support. There is a question covering this topic.

https://discussions.apple.com/thread/4035809?start=0&tstart=0

Sounds like there was a problem with the initial update so you'll have to wipe the drive and install the OS fresh. So you will loose any data you didn't back up before trying to upgrade.