System Performance - ERROR Workitems

Hi Friends ,

I have the following query .

I have no of workitems in ERROR status and workflow has been stopped . I dnt want to process those workflows further .

I dnt want those ERROR workitems to be cleaned from my sysetm . I think this ERROR workitems may hamper the syetm performace later .

Is there any way through which i can remove all these ERROR Workitems along with respective workflows from my system.

Is the ERROR Workitems affects the syetm performance .

Thanks in advance .

Regards

Prabhudutta