MacBook Pro Sluggish boot My MacBookPro has been extremely slow at the startup. Is there something similar to Window's System Registry that I can see all the boot files and uncheck what I don't need?

I'm running Mac OS X Version 10.6.8


Model Name:  MacBook Pro
Model Identifier: MacBookPro7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz  
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP71.0039.B0B
SMC Version (system): 1.62f7
try clearing temporary files and prefs (Note: do it within your user library not on system library. I had a bad experience with it before).