Upgrading Drupal

I am in the midst of a minor drupal 7 core upgrade. I've backed up everything, then created a new directory into which I moved all files from public_html, then placed the drupal 7.8 files in public_html.

I've been copying the necessary site specific files from my old installation into the new installation. In doing so, I looked for settings.php and found it appears neither in the files copied from my previous installation, nor do my 7.8 files include default.settings.php.

I downloaded 7.7. I need to upgrade to 7.8. How do I extract the archive and copy the files into my Drupal directory?

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Something went wrong with the upgrade of the site from drupal 6 to 7. I had a backup, but restoring it did not work. All links of the homepage were broken.

I wanted to have a functional site back up as fast as possible (the site is used to make appointments), so I downloaded the entire drupal 6 installation (files and database as SQL file), erased everything and installed a new drupal 7 installation.

So now I have a new site with the admins added, but I would like to get the old posts back into this site (as a reference).

All, I successfully upgraded to drupal 7.8 on Thursday. Everything was working fine, but today I cannot login to the administration page. I get the error below after about 30 seconds of waiting for the system to respond. At the moment, all my other pages are working normally, except I cannot login any more to manage my site!!! ACK. Please assist if you can. I spent some time re-reading the installation/upgrade sections of the documentation as well as searching the forums, but to no avail. Anyone else ever experienced this problem?

My host inmotionhosting.com has their proprietary webapp to install Drupal 7.0 automatically. After that I proceeded to install 7.7, and a week later (today) 7.8. I followed instructions on forum by copy everything into the main directory (and ignored backup since I am still brand new, nothing to lose), put site on maintenance, and ran update.php. Each and everytime it yielded a lot of errors afterward, but the site refreshed fine. Status reports shows the correct version (currently 7.8). Should I worry about this? Or my current Drupal may be "corrupted" even Status says all is green?

I just tried to install several themes for testing sake. I went through the "Install New Module" to install these themes: Zen, Marinelli, Pixture Reloaded (3 top downloaded themes). They all came out displaying a lot of errors, but somehow magically available to Enable in my Theme selection. Only Marinelli looks fine. Zen functions but it looks like it is missing some definitions (texts show in ugly default browser font and color). And Pixture Reloaded displays 10 lines of errors every single page.

Is this normal or something is broken inside and it will surface to add to my frustrations later when I attempt to do some work? And once again, Reports show everything is green, how much should I trust this?

I'm not sure if this is the right section to post but after updating from 7.7 to 7.8
i get a warning on admin/reports/status

Tokens Problems detected
 
The following tokens or token types are missing required name and description information:
* $info['tokens']['comment']['url']
 
The following token types are not defined but have tokens:
* $info['types']['comment']