Upgrading Drupal

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Edit 2: Disregard. The issue is caused by Clean URLs, which I didn't have enabled the last time I restored a backup to my Mac. I still don't know how to fix it but at least now I know what the problem is and what solution I'm looking for and it's nothing to do with the upgrade.
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I attempted to upgrade my D6 installation to D7, but when I hit my home page now, I get this string of errors:

I updated from 7.23 to 7.24. CHANGELOG.txt shows that this is 7.24. Yet the admin "Available Updates" page still says I have 7.23 and that 7.24 is an available update. When I run update.php in my browser it only says "no pending updates". When I check manually for available updates, it still says 7.23 is installed and I need 7.24...

Any ideas?

Brandon

Never mind... you can delete this post. I had extracted the update files to a very similarly named site, thus had not updated the site at all...

I've updated my d6 installation to d7, and for some reason, doing so has made my login URL disappear!
And thus, I can't get back in. Please help!

http://www.stylerepublicmagazine.com/user

It keeps saying "page not found"?

I've tried clearing my cache tables via MySQL, and that doesn't work either :/

I upgraded a site from 6.28 to 6.29. Then tried to update it to 7.24 following the instructions in upgrade.txt in the 7.24 download.

When I try to run update.php I get this error: DatabaseSchemaObjectExistsException: Cannot add index system_list to table system: index already exists. in DatabaseSchema_mysql->addIndex() (line 437 of /home2/discipm1/public_html/drupal/includes/database/mysql/schema.inc).

I went to install OpenLayers and found that I am still using PHP 5.2.6 and need to upgrade to a newer version. I've searched around on how to upgrade and haven't found any easy to follow instructions.

1) Can you tell me what is the best version of PHP to upgrade to at the moment? OpenLayers says 5.3 or higher, but I feel like I saw there were some downsides to 5.4 and 5.5.

2) How do I go about upgrading? I don't have YUM, RedHat REHL, Homebrew. Do I need to download one of these to upgrade?

Any help would be greatly appreciated.

Katmin