my neice is running a P4 3ghz 512MB machine. she has had OS problems ever since she bought PC. Technical support have been no use whatsoever so she asked me reinstall win xp for her (no recovery disc). Have recreated partion on disc and reformatted. Have been able to reinstall win xp and get on internet (dialup). When I try and install software from CDROM and then open my computer the whole system seems to hang for a few minutes and will normally need to be rebooted. If I open my computer with no disc in CD drive everything appears fine. Does anyone have any ideas what could be causing this???????