Upgraded MacBookPro6,2 to Lion and now computer freezes before login

Hi everyone,
As the subjed line says, I upgraded to Lion and everything smoothly (aparently), but after I tried to install Xcode for Lion the pc started getting slower and slower. The 10.7 Core libraries never installed (kept failing) and now the computer freezes before I can login. I tried to reinstall Lion (Pressing ⌘+R after hard powerdown) and following the prompts, but that failed. No reasons why, it just said user cancelled.
Before I wipe out my hard drive, is there something else I can do? Any help is appreciated.
Thanks

I am typing this reply from my MacBook Pro after recovering from the problem above. This post is for anyone else who might have the same problem. These are the steps to follow to be able to log back in:
Power down the computer and then press ⌘+R while powering up. This is called Lion Recovery, according to this knowledge base article: http://support.apple.com/kb/HT4718
In the options presented, select Disk Utility and verify the hard drive (HD) and repair the permissions on it. If your HD is not OK after verifying it, you will need to repair the HD as well.
Once the step above is complete, restart the computer.
Log in as normal.
Once you log in, it is important to find and solve whatever is causing the freeze.
In my case, it was a botched Xcode installation. If you do not fix the problem, the computer will freeze again next time you restart it, so make sure you check everything and uninstall anything that you may have installed recently. Some Adobe applications have known issues as of this posting (July 2011), so definitely remove anything new from Adobe you may have installed after upgrading to Lion or in the last couple of weeks.
Final note: If you cannot find the problem and your computer freezes again the next time you restart, you can regain access to it by following the steps above. Follow them, log in and make a backup of your important stuff and either go back to Leopard or contact Apple support for further instructions.
Good luck!

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