Firstly, at some point you're going to have to take some responsibility for sorting these problems out yourself - it's all part of the learning process and something you will have to do - you may as well start now!
A quick google search on your problem throws up this link pretty close to the top - http://support.apple.com/kb/HT2976, that pretty much explains how to troubleshoot your current problem. Using extensions manager will help you to create extension sets you can turn on and off whilst you're trying to figure out which extension/s are causing the problem.
Secondly, you need to use some common sense in sorting your extensions. There's an awful lot of extensions in your system folder you simply don't need. Find out what they all do and remove the ones you won't be needing - all those printer extensions for example for the moment won't be needed - round them all up and put them all into a separate folder outside the System Folder. Maclink for easy open? find out what it does, if you don't need it - take it out, likewise Speech Manager and Voices etc. By clicking an extension and going to 'get info' can tell you a lot about what the extension is, what it does and what part of the System Software it comes from.
A quick google search on your problem throws up this link pretty close to the top - http://support.apple.com/kb/HT2976, that pretty much explains how to troubleshoot your current problem. Using extensions manager will help you to create extension sets you can turn on and off whilst you're trying to figure out which extension/s are causing the problem.
Secondly, you need to use some common sense in sorting your extensions. There's an awful lot of extensions in your system folder you simply don't need. Find out what they all do and remove the ones you won't be needing - all those printer extensions for example for the moment won't be needed - round them all up and put them all into a separate folder outside the System Folder. Maclink for easy open? find out what it does, if you don't need it - take it out, likewise Speech Manager and Voices etc. By clicking an extension and going to 'get info' can tell you a lot about what the extension is, what it does and what part of the System Software it comes from.