Problem when installing wubi 9.10 under win 7 enterprise

[Chi Gao]

I was installing xp in C, win7 pro in G disk and ubuntu 9.04 with  
parition of 30GB in part of D disk . Yesterday I update my win7 to  
enterprise provided by my school in C disk, then I just
format the G disk holding elder version of win7, forgetting to  
uninstall ubuntu 9.04 using control panel. So I uninstall it manually:

1. Using the wubi uninstall exe file
2. Write a reg file that delete the wubi reg( under direction if  
someone on the net)

Then I run the 9.10 iso and choose the second buttun trying to install  
it in G disk with 30GB. The total volum of G is 85GB.

But there is always some problem when intallig it, here are 2 main  
phenomons:
1: when the installation goes around 73%, it comes to an error saying  
the installation cannot complete (sorry I forgot the details...if  
needed I mAy try it again and write down the detail reasons). Then I  
was led into ubutu, login and there is an installation icon on desk. I  
click it and it says I need some steps to complete the installation.  
There are 6 steps and whn I goes to the 4 or 5, it says errors in disk  
partition, and led me to the disk manager. Nomatter what I do(such as  
format the G disk)

2. Sometimes I finished installing the ubuntu(it just goes to 100%),  
and reboot my laptop. While there do be two choices when restart: win7  
and ubuntu. But when I choose ubuntu, it comes grub:>sh and I don't  
know what to do with it. I have checked the Internet and found someone  
had the same problem with me when using 9.10 beta, unsolved.

I tried many times reinstalling, never works.

Just now I tried to install 9.04 on g