My refurbished netbook has no operating system but came with a genuine windows 7 product key sticker on it. can i reinstall this windows 7 operating system? s

Using the recovery partition to reinstall Windows 7 (if the partition is available):

Samsung - Recovery Partition - Restore Windows: see the "Performing A Complete Restore" section about half way down the page:
http://ars.samsung.com/customer/usa/jsp/faqs/faqs_view_us.jsp?SITE_ID=1&PG_ID=1&PROD_SUB_ID=1352&PROD_ID=0&AT_ID=357463




Call Samsung - to find a phone number for your location:

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Have Questions About Installing Windows 7?
FAQ - Common Windows 7 Installation Questions & Answers

Which edition of Windows 7 came preinstalled on the Netbook?

If its Windows 7 Starter, see the following instructions for reinstalling:

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

If you can't, download one of the following:
Windows 7 Home Premium 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/5438005/eicfg-removal-utility-lets-you-use-any-product-key-with-your-windows-7-disc



we will edit the image and remove the ei.cfg file so we can reveal all editions of Windows 7 during the installation and select Windows 7 Starter. Lets take a look at doing it step by step.



After downloading the eicfg removal utility, you need to extract, since its in a .zip file. Just right click it and click Extract All.



Double click the eicfg_remover.exe file to launch it.



Browse to where the Windows 7 Image (.ISO file) is stored, select it and click Open.



That’s it! the ei.cfg file is now removed. The next step now is to reinstall Windows 7 Starter. Because most Netbooks do not include a DVD drive, you will have to use a tool such as the Windows 7 USB/DVD Download Tool (http://store.microsoft.com/Help/ISO-Tool)
This simple tool will help you convert the same image file into to a USB thumb drive. For installation purposes, you should get a thumb drive that’s at least 4 GBs in size to store the installation files. Browse to where the Windows 7 Image is stored, open it.



Select the USB device where you want to have the backup stored to for installation.



Once the USB device has been identified, click the Begin copying button.



And that’s it, the next step now is to boot your Netbook from the thumb drive, make sure the thumb drive you will be installing Windows 7 from is plugged into the USB port. This might vary by manufacturer, but the usual one to try is F12, start your Netbook and press F12 repeatedly until a screen is displayed giving you the option to boot from a USB Memory device, select that and press Enter on your keyboard.



Windows 7 will boot as it normally does into the setup environment, the only difference this time is, you will be given a choice to select the edition of Windows 7 you want to reinstall. Carefully click through during the setup wizard.



Select Windows 7 Starter and proceed with the installation as normal. I suggest that you create a backup once the installation is complete.

http://www.notebooks.com/2009/10/24/how-to-backup-your-installation-of-windows-7/

If its another edition:
Download the corresponding edition and see the instructions in the link below about how to reinstall Windows 7 on a Netbook:

How to install Windows 7 on a Netbook from USB drive - Microsoft ...
Windows 7 (English) with Service Pack 1

• Windows 7 Home Premium (x86) - X17-58996

• Windows 7 Home Premium (x64) - X17-58997

• Windows 7 Professional (x86) - X17-59183

• Windows 7 Professional (x64) - X17-59186

• Windows 7 Ultimate (x86)* - X17-59463

• Windows 7 Ultimate (x64)* - X17-59465