New Mac Book: very unstable on several apps???

Hi all,
I just bought my gf a brand new macbook, so she could change from a crappy toshiba with windows to osx.
After a few weeks of running it, I have come to the conclusion that it is not working well at all!
To start with, she works on large word files. I have installed both office for mac 2004 and the new 2008,. but both show very poor performance, and keep on crashing to desktop when using advanced functions. (how hard can word really be on a processor???)
Then, Safari is also very unstable. When using about 5 tabs or more, it usually crashes as well, or starts hanging for ever. Also, when opening pdf files in safari, with the adobe plug-inn, it usually also hangs safari, very annoying!
but then it came to me last night: All these problems must be leopard related.
I run a G5 Quad myself, and upgraded to leopard, only to downgrade it the next day to tiger, since most of my apps were very unstable on leopard.
So my question is, do you guys think my assessment is correct, and that the most likely solution to the problems I am having is a downgrade to tiger?
I'm hoping to get some oppinions on this.
Thanks in advance for any input.
Cheers,

Just to build on what hyphen has said:
Don't use earlier OS than came with the computer:
http://docs.info.apple.com/article.html?artnum=25784
Additionally, read about About "Downgrade" installations
+"You should not reinstall an earlier version of the same software over a later version. These "downgrade" installs may seem to work, but Apple does not test nor recommend downgrade installations in most cases. Some installers prevent downgrade installations. If you need to reinstall an earlier version of Mac OS X, erase your disk first or choose the erase option in the Mac OS X Installer. Be sure to reinstall any software updates after reinstalling the operating system."+
-mj
[email protected]

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