My Ubuntu 8.10 crashed due to the overheating problem of the CPU when I am opening some directory and intend to do some file transfer under Nautilus. After reboot, under gnome, all the files cannot be removed, their properties cannot be viewed and they can only be opened, although all are still fine under terminal. I was wondering why is that and how can I fix it?

Thanks and regards

UPdate

$ cat /etc/mtab  
/dev/sda7 / ext3 rw,relatime,errors=remount-ro 0 0  
tmpfs /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0  
/proc /proc proc rw,noexec,nosuid,nodev 0 0  
sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0  
varrun /var/run tmpfs rw,nosuid,mode=0755 0 0  
varlock /var/lock tmpfs rw,noexec,nosuid,nodev,mode=1777 0 0  
udev /dev tmpfs rw,mode=0755 0 0  
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0  
devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=620 0 0  
fusectl /sys/fs/fuse/connections fusectl rw 0 0  
lrm /lib/modules/2.6.27-15-generic/volatile tmpfs rw,mode=755 0 0  
/dev/sda8 /home ext3 rw,relatime 0 0  
/dev/sda2 /windows-c vfat rw,utf8,umask=007,gid=46 0 0  
/dev/sda5 /windows-d fuseblk rw,allow_other,blksize=4096 0 0  
securityfs /sys/kernel/security securityfs rw 0 0  
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0  
gvfs-fuse-daemon /home/tim/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=tim 0 0