Installed Mavericks and now my system partition needs repair

Hi All,
I upgraded to Mavericks yesterday, but after the install my MBP's performance/responsiveness was substantially degraded.
Today (after reading posts from users experiencing similar issues on the forum) I ran disk utility. After verifying the disk, the utility told me there was a problem with my system partition, and that I would need to run disk utility from recovery mode (cmd + r).
I did so, and when I verify the disk from recovery it returns: "The partition map needs to be repaired because there's a problem with the EFI system partition's file system". When I attempt to repair the partition, I receive an alert that: "Live file system repair is not supported".
Now I can't even boot into the log-in page, and the only area I can access (aside from the blank grey screen with a picture of a folder on it) is the recovery mode. I would really like to avoid re-installing Lion from recovery mode and losing all my programs, settings, etc. Any advice would be much appreciated.
Thanks in advance.

My two cents: I upgraded to Mavericks and found the EFI corruption error when verifying permissions immediately afterward. Tried the install a couple of times to make sure it wasn't a fluke. I was unsure how to get Lion back on the laptop, as the Mavericks istaller had updated my HD Recovery to 10.9, and my back up was manually done; I wanted a truly clean install without using migration assistant or Time Machine.
However, by completley erasing my hard drive and doing internet recovery, Lion was available. I'm back in business with a clean install of Lion and won't be trying Mavericks again anytime soon.
Incidently, my OS volume was okay and I could use the computer. As far as I could tell, only the EFI partition was corrupted. Not sure of the long term effects of that, but assume I wouldn't be able to accept firmware updates in the future at the very least, and who knows what else might develop, as several of the other posters here are experiencing. Feel like I got off relatively lucky.
I mostly wanted to point out that the machine's original OS recovery should be available via internet recovery, even after the Mavericks install has removed that option from the HD recovery.

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Installed Mavericks and now my system partition needs repair

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