Question about Outlook Express

when ever I view email messages in WLM they take along time to apear in the preview pane. doesnt seem to matter if it is plain text or html or with embeded pictures etc. have tried repairing it through control panel but didn't help at all. have ran avg antivirus, microsoft security essentials, malware bytes antimalware, and spy bot search and destroy nothing was detected. this justb started within the last month. any suggetions??