Last things first! When you are done with getting what data you want /can get off, like John, I'd give that disk a complete fresh start, ie format.

When you say the folders are inacessable, what do you mean? Is it ntfs permmissions stopping you, you can't find the folders or what?

Depending on what the problem is, one thing you could try now you have got it at least in some sort of working order is to disconnect your new drive, revert to your old configuration and see if it will boot up. It could be easier to back up to CD that way if you can. (you could just try to boot on the old one with the new one in place but you might get confused and do something you don't want to). Go back to your new configuaration after.