Borrow a friends Genuine Windows 7 32 bit DVD disc if you know someone who has one.

Make an image of the DVD, you can use a program such as ISO Recorder to do that.
http://alexfeinman.com/

If you don’t have a Windows 7 DVD to borrow, try downloading an image:

32 bit
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65732/X15-65732.iso

You are going to edit the contents of the .ISO file and remove the ei.cfg file. After editing burn it to a blank DVD disk or put it on a thumb drive. Boot from it, this will reveal all editions of Windows 7, select the Starter edition. More information in the following article about how to edit the ei.cfg file

Ei.cfg Removal Utility Lets You Use Any Product Key
http://lifehacker.com/#%215438005/eicfg-removal-utility-lets-you-use-any-product-key-with-your-windows-7-disc

You can create a bootable thumb drive with the following:
Windows 7 USB/DVD Download Tool
http://store.microsoft.com/Help/ISO-Tool

Skip entering your Windows 7 product key and complete the installation.

Once you reach the desktop, click Start, right click Computer

Click Properties

Scroll down to Windows Activation

Click the link x days until activation.

Click the link that says ‘Show me other ways to activate’

Enter product key (this is Windows 7 Starter key which would be located on the COA sticker at the bottom of your laptop)

Click Next

Select Phone Activation

Click Next when Enter your key page displayed

Select your country

Click Next, call the number listed

Remember to explain to the call agent your situation.

They will give you a confirmation ID, enter it

Click Next to complete the activation.