New Mac Pro. Lion upgrade completed but OS having problems

I upgraded last night my Mac Pro to Lion, I bought my machine 3 months ago.
The machine was already having issues right after the install, its running very slow. Been trying to fix it but cant find whats slowing it down, I have Office 2011 and Skype installed.
I don't think I have much choice but to reinstall, but Lion does not seem to allow but media to be burned so I can do a clean reinstall.
I have found on the internet ways to burn the OS, but this only seems to work before the OS is installed. Is there any way to redownload it if you have Lion installed?

How to Create & Burn a Bootable Mac OS X Lion Install DVD
Summary
OS X Lion includes a new feature called Lion Recovery that includes all of the tools you need to reinstall Lion, repair your disk, and even restore from a Time Machine backup without the need for optical discs.
To redownload the installer on a computer running OS X Lion, press and hold the Option key while you click the Purchases tab. If the button to the right of the Install Mac OS X Lion item doesn't change to "Install" and allow you to download Lion, use Spotlight to search for "Install Mac OS X Lion" on your computer....
http://support.apple.com/kb/HT4718

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