For some weird reasons, the site owner wanted to disable out of the box workflow: Collect Signature from a particular site collection.
In SharePoint 2010, These workflows can be simply activated/deactivated from Site collection features. Refer my post Unable to find OOTB Workflows – Approval, Collect Signatures, Feedback for more info.
But in MOSS, It’s a little tricky. These workflows (Almost all others too) are deployed as a Feature and lives in 12 Hive.
So we can manually deactivate these features to remove default workflows in SharePoint. Here is how:
stsadm -o deactivatefeature -filename SignaturesWorkflow\Feature.xml -url http://Site-collection-URL
And if you want to enable it back:
stsadm -o activatefeature -filename SignaturesWorkflow\Feature.xml -url http://Site-collection-URL
Here is the screen once deactivated: