What are you having trouble with exactly?
What are you experiencing or seeing on the screen?
What has lead you to where your are now and where do you want to go?
What is your Apple > menu > About this Mac > more information > Model Identifier (ex: "MacBook Pro 4,1") ??
What is you RAM amount? Is your OS X version 10.6.8?
Open your Activity Monitor and click on drive usage and tell us how much in percentage it is full.
Open the Terminal program in your Applications/Utilities folder and copy/paste each line below into Terminal and press enter after each.
kextstat -kl | awk ' !/apple/ { print $6 } '>~/Desktop/kextstat.txt
ps -A >~/Desktop/process.txt
ls -@AOen L*/Preferences>~/Desktop/preferences.txt
Then open the three files appearing your Desktop using TextEdit, then Select All text and Copy/paste the results from each of the files into your problem post thread here.
This will tell us your running kext files, your active processes and your preferences files.