Installing Drupal

Hi there! I've installed drupal 7.x (just upgraded to 7.2 and that went just fine) and I've got some errors when I'm logged in as admin and in the "module" section. These errors has been showed since the first time I've installed drupal and they were also there when I made the upgrade today. Anyway here they are:
Warning. opendir(sites/all/themes/reallyblue) [function.opendir]:failed to open dir: No such file or directory in file_scan_directory()line 1973 of c.\wwwroot\www.mydomain.com\drupal\includes | file.inc).
Warning. opendir(sites/all/themes/simply_modern) [function.opendir]: failed to open dir: No such file or directory in files_scan_directory()(line 1973 of c:\wwwroot\www.mydomain.com\drupal\includes\file.inc).

Now, I'm using windows 2003 server with php 5.x and mysql databes. The drupal directory is installed in the directory /drupal under an domainname (which I called www.mydomain.com in the text above) that is fully operational and online on the internet) but I still use drupal as a testsite. So far drupal rocks :) but I really want to get rid of these errors.

I think the title should could say it all. I'm working with a facebook addon on my Drupal site and now I'm working on the comment system, as you can see in these 2 posts on my site;

http://no-illusions.nl/re-creatie_v2/node/10
http://no-illusions.nl/re-creatie_v2/node/8

I was having trouble with drupal and the only way Uyto fix it was to do a full wipe. I deleted my db and drupal and started fresh. The install went fine, no errors. It got the confirmation and checked out my new site. I went to do chores and when I 8am back and tried to visit my site, I got an error that said my page couldn't be found. I didn't touch a thing our edit anything.

Very simple problem. After entering MySQL database information I get the following error:

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'drupaldatabase.users' doesn't exist

Tried this on two different databases, with minimal and standard installs, with database table prefixes enabled and disabled, and the same thing happened each time. I see people having a similar problem with upgrades.

An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: http://piratkopi.no/piratkopi/install.php?profile=standard&locale=nb&id=... StatusText: Internal Server Error ResponseText: Fatal error: Allowed memory size of 14680064 bytes exhausted (tried to allocate 90748 bytes) in /home/starpc/web/piratkopi.no/piratkopi/includes/registry.inc on line 144

Any help on how to get this error fixed?

I'm trying to install drupal 7 in my computer.
My computer is windows 7 professional and installed appserv ver. 2.5.10
When installed D7, it needs PHP ver 5.3 so i uninstall 2.5.10 and installed appserv 2.6.0
After installed, http://localhost is working but http://localhost/phpMyAdmin is showing blank page.
Anyone who has an idea please help me. I want to install D7.
Thanks.