MBA tooooo slow ... need help

I have a first genration MBA, I love it but it is very frustrating that it is gotten so slow in the last month or so. So I bought the Genious Drive and went through the whole schpiel, checked permissions, and even did a defrag (although I thought for UNIX system you don't need a defrag). Nothing has helped.
To open MS Word it takes literally 1:15 minutes to get word up and running.
So I read in here that I might want to re-install the OS. I don't want to re-install all the apps I have.
Soooo here is the question. How can I re-install the OS without having to re-install the apps.
What do I need to back up and how do I re-install it after the new OS is up and running.
Thank you in advance.
PS: OS X 10.5.5

remenda wrote:
Your theory about CPUs getting "slowed down" is certainly novel, but has no basis in what people learn in computer engineering school.
You might like to constrain your comments to concepts you have knowledge of <Edited by Moderator>. CPU clock and voltage scaling has been a part of system power management for years, and was certainly a topic of my BEng (Computer).
This problem has nothing to do with fans. The problem manifests itself at all temperatures.
The reason you might believe the issue occurs "at all temperatures" is that you are observing a system that contains feedback. Work is done -> CPU heat rises -> power management scales back (and system performance drops) -> temperature drops. Looky there, it's happening when the system is not hot.
This is a software problem - the kernel is occupying massive amounts of CPU time in the log_level function.
... which explains why a hardware repair fixed the issue. Right.
As I noted in the post I linked earlier, I don't claim every MBA suffering "kernel_task" issues has a hardware fault, but it certainly was for me.

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