Installing Drupal

I have installed many cms sites before but I have never had this much trouble. I am currently trying to install D7. I have alway's used an app called appserv that installs appache, php, mysql etc very easily. Normally I just upload "in this case drupal" to the main sites directory. Create the database, and run the install. It has been a little while since doing this but today I am trying to install D7 for testing for my work.

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I am new to Drupal and so please bear with me if my question is naive.

I am trying to create a site on Drupal7 and am getting the following popup error when I am starting Apache HTTP Server 2.2

PHP Startup: PDO: Unable to initialize module Module compiled with module API=20050922, debug=0, thread-safety=1 PHP compiled with module API=20060613, debug=0, thread-safety=1 These options need to match

I am migrating an existing Drupal 6.x website to a new domain and hosting.
Setup the domain, uploaded the files, uploaded the SQL database file but my pages are not loading.
Any ideas on what to fix. I am not sure what to change in the .htaccess file because it looks new.
http://tinyurl.com/727zozx

Hello,

this seams pretty general, but I post it in here. @mods: please move it, if you want to

... so... I installed a new module called Date field... it sounds really great but it didn't work for me, because the drop down for selecting a widget is disabled... first I thought the module is broken, so I disabled it and tried to select a widget for other fields... but it's also disabled. I can change the widget on existing fields, but when I try to add a new field, I can't.

Does anyone know, why this happens? Thanks :)

When i Pass Configure site and press save and continue THis error appear

Fatal error: Call to undefined function field_attach_load() in C:\wamp\www\Drupal\includes\entity.inc on line 320

I've installed Drupal many times, but I've never come across this problem. I know that when you are running the install, you need to chmod the /sites/default/files and sites/default/settings.php so that apache can write to it. I usually just change it to 777, then when the install is complete, change it back to 775. But right now, this permissions error is coming up.

{[(Web server Apache/2.2.15 (CentOS)

PHP 5.3.3

PHP register globals Disabled

PHP extensions Enabled

Database support Enabled

PHP memory limit 128M

-Error
File system
The directory sites/default/files is not writable. An automated attempt to create this directory failed, possibly due to a permissions problem. To proceed with the installation, either create the directory and modify its permissions manually or ensure that the installer has the permissions to create it automatically. For more information, see INSTALL.txt or the online handbook.

Unicode library PHP Mbstring Extension

Settings file The ./sites/default/settings.php file exists.

-Error
Settings file The settings file is not writable.
The Drupal installer requires write permissions to ./sites/default/settings.php during the installation process. If you are unsure how to grant file permissions, consult the online handbook.)]}