NOTE: You need to be a machine administrator in order to Retract and remove a solution via Central Administration.
In SharePoint Central Administration, go to the Manage Farm Solutions page (its called Solution Management in SharePoint 2007).
In SP2010, click System Settings > Manage Farm Solutions.
|2.||Solutions are listed alphabetically. Find the solution you need to uninstall and click its Name. The solution status will be displayed.
NOTE: The image below is from SharePoint 2010, but solution status from SP2007 and SP2013 look very similar.
If the solution is deployed, you will see a Retract Solution link at the top of the page. If the solution is not deployed, you will see a Remove Solution link.
|3.||Retract the solution from all web applications.
Choose to retract now, or schedule it to occur at a particular time. Choose to retract from All content Web applications. Click OK when ready.
NOTE: IF you are not a machine administrator, you may see an Access denied error. Make sure you have the appropriate permission level before attempting to retract a solution.
|4.||Remove the solution. Once a solution has been retracted, the Remove Solution link is shown.
Click Remove Solution to remove the solution.