I had download and then install New Windows Live Messanger 8.1.0178.00 some days before from microsoft. After install and reboot I had seen that something had eaten 4gb of hard disk space on primary drive C. There was undeletable files on the drive. Then I had to format Drive C: and install windows xp sp2 again and then explore the Install_Messenger file through winrar and then explore msnmsgs file. It have some files that also cannot deletable. These files size are also upto 4gb... What is this?????????????