263 Sunday 264 Monday 265 Tuesday 266 Wednesday 267 Thursday 268 Friday 269 Saturday 530 AM 531 PM 532 st 533 nd 534 rd 535 th 536 Cannot Schedule Weekly Scans 537 You must have Administrator-level user permissions before you can schedule scans. 538 The NT Schedule service must be running before you can schedule scans.\n\nIn the Windows NT Control Panel, select Services. Set the NT Schedule service to run automatically at system startup, and click Start to run the service now.