Inspiron 1150 has following specification: (http://www.cnet.com/laptops/dell-inspiron-1150/4507-3121_7-30836485.html), Intel Celeron 2.5GHz, Intel Extreme Graphics 2 - max 64.0 MB shared memory, Max 2GB RAM.
Ubuntu with Unity desktop probably will not work as the Intel graphics card don't have all necessary 3D functions (Intel 852 / 855 chip-sets). Try to disable 3D in BIOS set-up and try again, not sure if this is the option. If not try to upgrade the BIOS to its latest version. Due to your hardware I don't recommend to use Unity desktop anyway.
For Inspiron 1150 I recommend to use Xubuntu (with xfce desktop http://xubuntu.org/getxubuntu/) or Lubuntu (with lxde desktop http://www.lubuntu.net/), which have lower demands to the hardware set-up, but they does not have Unity. Your Ubuntu 10.10 does not have Unity either, but uses Gnome desktop. You will need 32bit installation. Try the live version first to be sure it will work.
And please upgrade ram to its max (2GB). This will help the computer to bear 12.04 or 13.04 version of Xubuntu/Lubuntu.