Ubuntu Installation :: Installed Successfully But Now "error:no Such Partition, Grub Rescue"

I'm a complete newbie, trying to get away from Windows Vista! I had some issues installing Ubuntu, but finally got it sorted - so I thought. I wanted to view a dnl file, so tried to boot into Windows, and I got a white screen with big red letters saying "ERROR". So I held down the off button for 5 seconds, and then tried to reboot. But now all I get is the words:

error: no such partition
grub rescue>

Before I go further, I'll summarise the problem with my install. Basically it would only get partway through, if at all, and then all the options would freeze...I could move the mouse, but that was it. Similarly with running Ubuntu on the LiveCD. After a lot of hassle, and some helpful members of the community, it turned out that all I needed to do was use the option "nomodest" when installing, and it all went fine. Well actually I had to retry it again in recovery mode because I think maybe a driver wasn't loaded (?), but after that everything seemed alright. So as mentioned before, I've come to my present issue. Typing "Is" gives "Unknown command" (or maybe "invalid"...I can't remember). And if I type "set" I get something like "prefix=..." and something else...sorry I can't remember and I don't want to turn off the computer now just in case things don't work again.

Anyway I managed to boot and run Ubuntu using the LiveCD, and started looking for solutions. Note that I used the "nomodest" option again to boot. Anyway all the solutions involve first using "fdisk -l" to find the partitions. Here is the output:

[Code]....