Well it looks like your installation of Drupal had some issues. For some reason the "variables" table doesn't exist. Did you delete it on accident? The first error looks like it's because the variables table isn't there, so it can't delete the rows that start with "uc_notify".
The second error shows that the uc_store_footers table ALREADY exists - so you are trying to create a table, but can't since it's "already" there - the error in this case wouldn't affect normal cart operation (it'd be a one-time thing that you could ignore).
The last errors appear to be getting thrown because the arguments are invalid, but are most likely the result of the other errors (or other errors not listed here).
My advice: delete your databases, reinstall Drupal, then reinstall Ubercart and the modules it REQUIRES - Tapir, Workflow_ng, etc. Make sure you install those first and then save changes; don't go and install all modules all at the same time.
Then install the optional modules such as Imagecache / Imagefield, CCK, Thickbox, etc. Make sure you aren't getting any database errors on any of these.
Then configure your cart. Make sure you setup the important stuff - your origin address, your shipping APIs (if applicable), credit card modules and info, all that stuff.
Basically, follow these instructions to a T: http://www.ubercart.org/docs/user/802/new_drupal_installation
Sorry for being verbose about this. I've installed Drupal and Ubercart 3 separate times on two boxes, and upgraded core Drupal, core Ubercart and other misc modules on my Apache / Linux box with no issues whatsoever. The fact that you are having problems with the setup is an issue to be taken seriously, but we have to rule out any extraneous mistakes during installation or other unknowns before we can really determine what is going wrong.
Good luck and let us know how the reinstallation goes. Remember, I don't mean just reinstall Ubercart; if at all possible, remove all the files from your webroot / public html folder and reinstall from scratch. Sometimes it's necessary in a case like this and I think it'll be worth it. If you can't go that far, there are other ways, including backing up the database and unpacking the tarball, resubmitting your settings.php file, etc.
EDITED for beautification of code