I have searched the forum, and see others are experiencing the same issues. Yet I do not know how to resolve it. Any help would be appreciated. We have SEVERAL machines running Windows 200 Professional (5.00.2195) with sp4. We applied all security patches, windows updates, etc., earlier this week, on two machines, and now they won't print 100% of the time to the network printer. HPLaserjet 4300n. It will print a windows test page. It will print from Word or Outlook. It will consistently fail if you try to print from the internet or our accounting package syspro6. When printing from IE we receive the following error: Function address 0x4f53ef90 caused a protection fault. (exception code 0xc000005) Some or all property page(s) may not be displayed. If anyone knows a work around, or which hotfix I should "uninstall", your comments and suggestions are welcomed. We have already deleted and reinstalled the printer, looked for updated drivers etc. NOTE: our xp machines appear to be uneffected by security updates. We are still able to print in the XP os. CAN YOU HELP ME PLEASE?