If you are using Microsoft Office 2007 version, then you would be missing Microsoft Office SharePoint Designer 2007 which does not come within the MS Office 2007 package and you need to buy this out separately. You can get free ms office softwares for a limited period after which if you are happy with them you can buy them online.

Office SharePoint Designer 2007 provides the powerful tools you need to deliver compelling and attractive SharePoint sites. Build workflow-enabled applications and reporting tools on the SharePoint platform, in an IT-managed environment.

You can directly access the microsoft website which i mentioned above and click on the download link which is followed by ‘Microsoft Download Manager’ a very small application which is first downloaded and offers you with Pause/Resume feature while downloading these packages. Since you enter your email address before starting the downloads, Microsoft will send you the Product Key which should be entered once the software is downloaded and installed to your computer.

Here is a preview of sharepoint designer