ubuntu installation fails every time

[Shub]

I want to install Ubuntu with window 7 as a dual boot PC. I am new to Ubuntu.

After Booting from pendrive when I choose "intall ubuntu on Hard disk" , then installation window comes, I choose "do not connect to wifi right now". Then choose "installation type alongside window 7". After clicking "continue" a black scrren comes for 2 seconds and then my pc again restart and **window 7 starts every time**. (after step 4 as mention on http://www.ubuntu.com/download/help/install-desktop-latest)

I am using my pen drive to boot (I made it Ubuntu bootable from http://www.pendrivelinux.com ) and i tried this installation using wifi connected and disconnected as well as.But i prefer to disconnected during installation.and these are not the actual problem.

(After booting from pen drive selecting after install ubuntu on Hard disk it goes to select language option and then prepare to install Ubuntu and after the step "install alongside window7" pc again boot to window 7 (That is the Problem).
But first and second time after boot instead of installation window it directs into a black screen command modes where lots of commands are shown and it shows write help command.Then i am unable to do anything and have to turn off my laptop with power key.)

I am using Ubuntu 12.04 desktop- i38.iso (735,358,976 bytes)

Md5sum is : d791352694374f1c478779f7f4447a3f

- Laptop model: compaq presario cq62 -112tu

- RAM: 2 GB

- Intel i5 430 M processor

- 290 GB HDD: C drive 29.2 GB free of 49 GB;

- D drive 121 GB free of 120 GB and

- E drive 21.3 GB free of 127 GB

- and HDD is simple (not dynamic)

I want to install Ubuntu in D drive alongside Window 7. Is it okay or wrong and how to do this.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Quinn Balazs (qbalazs)]

Incomplete because of the amount of time since the last comment/change. If this was to be reopened it should be filed against the "linux" package.

This has been marked incomplete in an attempt to tidy up the bugs against the installation-guide package, to make sure all outstanding bugs get addressed. If this issue is still present, please reopen this bug against the "linux" package.

Quinn Balazs

[Launchpad Janitor (janitor)]

[Expired for installation-guide (Ubuntu) because there has been no activity for 60 days.]

[kostas (kostasubuntu)]

i need the 12.04 386