By default, Microsoft SharePoint Foundation 2010 has only one predefined workflow, the three-state workflow, which is active when you create a site or site collection in SharePoint Foundation 2010.
To deactivate or activate a workflow in SharePoint, you must be a member of the site collection administrators group on the site collection that you are configuring.
To activate a workflow for a site collection:
At the top level of the site collection, on the Site Actions menu, click Site Settings.
On the Site Settings page, in the Site Collection Administration section, click Site collection features.
On the Features page, click Activate next to the workflow feature that you want to activate.
The status column will display Active after this.