I tried to install Q&A module but uninstalled it back when I realized it wasnt functioning. However I keep getting its event failure on my event log as follows: 

THREAD ID:3

TYPE:DotNetNuke.DNNQA.Components.Tasks.Emailer, DotNetNuke.Modules.DNNQA

EXCEPTION:Could not load file or assembly 'DotNetNuke.Modules.DNNQA' or one of its dependencies. The system cannot find the file specified.

RESCHEDULED FOR:7/27/2015 11:46:04 AM

SOURCE:STARTED_FROM_TIMER

ACTIVE THREADS:0

FREE THREADS:1

READER TIMEOUTS:0

WRITER TIMEOUTS:0

IN PROGRESS:1

IN QUEUE:7

Server Name: speedwell

Please how can I correct this?