Macbook pro early 2008 freezing only in OSX

Hi everyone,

My macbook pro early 2008 (last model before the unibodies), 2.4 Ghz, 4Gb, 8600GT freezes only in OSX.

I'm typing this message right now on the same computer, but on windows 7, bootcamp.

Whenever I boot up OSX the system freezes every few seconds for a minute, only to resume work a few seconds before freezing again.

I know it isn´t a harware fault, since I can still boot up in windows 7 and use the snow leopard CD, which brings me to the next point.

I´ve allready used the disk verifty (which pointed out errors) and the disk repair (which was succesful).

I´ve also verified permissions and repaired them successfully.

What I´ve also done is turn off the sudden motion sensor.

The last thing I´ve tried is running the software update, making sure the system is up to date.

The battery is a few months old (new one) and the power cable works as well.

All of which did not work. I really don´t want to do a complete disk wipe since the backing up is horrendous.

I´ve read a lot on the subject, but since I don´t use an external monitor or have the unibody one the supposed solutions do not apply to me.

Thanks for you help!