I have a P3 PC (700Mhz) PC with 768Mb SDRAM and plenty of SCSI160 disk. I have a clean install of Windows XP Pro with SP1. I have this on two separate hard drives, i.e. two completely independent copies of XP. Very very frequently, if I use the windows key and E to launch explorer, the shell list is displayed but My Computer is not expanded. No amount of effort will expand this, and I can never see my drives. Task Manager shows "My Computer" as Not Responding. All I can do is end the My Computer task, or alternatively end the Explorer process. If I do a Start, Run then type "Explorer C:\" it works okay. I can recreate this on both partitions. This never used to happen with XP Pro. It is only since I installed XP Pro with SP1. Has anyone seen this before, or does anypne have any suggestions? I have already done the "REGSVR32 /u zipfldr.dll" (and CAB) to prevents scanning of ZIP files. This is driving me insane! Many thanks. Jim