Giving write permission to the Files folder

[rflemin]

I'm trying to install Civi on a desktop WAMP PC for development and testing of new modules. I keep getting the infamous "The user account used by your web-server needs to be granted write access to the following directory in order to configure the CiviCRM settings file:
/C:/wamp/www/drupal-7.12/sites/default/files". I finally used ATTRIB to remove the Read Only setting on the folder, but still get the above error message. I have a feeling that my problem is the User Account referred to. I set the MySQL usernames for both databases to Drupal, but have no idea if this is the right place to set the user name or if I have to go into Apache and tell it that Drupal has permission.
Surely this issue has been resolved and written up, but I can't find it. Can anybody help?

[mr6volt]

I have the same problem with my WordPress install. If I comment out the section that verifies write access, I get a 500 error after the install process. I know the install worked, because it wrote all the needed files in both the folders that it wanted to verify.