The restricted trust level is not supported + Infopath

Recently I tried to create an InfoPath 2007 form template and publish it to a SharePoint Forms Library and I received the following error:The restricted trust level is not supported.

This Form template cannot be uploaded to the server.Review the following 1 error(s) for more information.
Errors
The restricted trust level is not supported.

-Make sure that the form’s trust is set to domain.
-Go to Tools > Form Options > Security and Trust and Uncheck “automatically determine security level” and select “Domain”or "Full Trust" as the level of trust.
-Click “Ok”.

To publish InfoPath 2007 form to a SharePoint library:

Using SharePoint to Verify and Upload the Form Template

The SharePoint Central Administration site contains the Upload Form Template page,to verify a form template before uploading it. Once the form template is verified, enter the path to the form template and upload it to the server.

To verify the form template by using SharePoint Central Administration
1. Click Start, click All Programs, click Administrative Tools, and then click SharePoint 3.0 Central Administration.
2. In the top navigation bar, click the Application Management tab.
3. On the Application Management page, under InfoPath Forms Services, click Upload form template.
4. On the Add Form Template page, click Browse.
5. In the Choose file window, browse to C:\InfoPathLabs\deploylab01.xsn, click the template, and then click Open.
6. In the Deploy Form Template section, click Verify.
7. In the Report Details section, look for any errors and warnings for the form template.
8. If the system warns you that the template already exists, click Application Management, click Manage form templates, click the arrow that appears next to the form template, and then click Remove Form.
9. On the Remove Form Template page, click Remove.
10. If you did not receive a warning, click OK.