Not-So-Quick Answer:

The numbers you see from your adwords account and the numbers available in analytics may vary for a few different reasons. I would start by making sure you’re using the most up to date code for analytics on your pages and ensure the code for tracking your ppc and the code for tracking your metrics play nice. Unfortunately it is not always the case and you may have to tweak it a bit. Once you’re sure this is done
check out this article:
http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=55610

It gives other reasons why the numbers may be different.

And always remember, metric accumulation and analysis is more of an art than a science. Take all numbers with a grain of salt and find a checks and balance system that allows you to get a good idea of how you’re site is doing without putting all your eggs in one basket.

Cheers!

Try and check if the code has been copied properly or not..