Installing Windows 7 on my Lenovo S10 Multiboot
Las time I installed BackTrack 4 using Unetbootin. This time I Installed Windows 7 to my Hard drive without using an external CD player. Instead I used an external hard drive. Can also be done with USB.
I already have Ubuntu installed so I downloaded Unetbootin and I obtained the Windows 7 DVD in ISO format.
I fired up Gparted and made a 10GB partition for Win 7 and formatted the partition used for install and the external hard drive with NTFS.
Changed the permissions of the Unetbootin file:
chmod 777 /home/user/Desktop/unetbootin-linux-372
Fired up Unetbootin, entered my password and selected the Win7 iso and changed the type to hard disk. Here make sure you select the right partition of your external drive. you can type df -h in terminal to make sure.:

Press Ok and wait

Reboot and have your BIOS boot from external drive or hold down F12 to select.

The installation is self explanatory. I installed the WIndows 7 to a logical partition. After installation, I had to boot up into an Ubuntu live installation and fix grub like I did here. Opened menu.lst for editing the grub menu:
sudo gedit /boot/grub/menu.lst
Add this to the end of the file and close:
title Microsoft Windows 7
root (hd0,0)
makeactive
chainloader +1
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