Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to get windows 7 for free [title] Determine when you purchased your computer. [step] If you are running a pre-windows 7 operating system, you may be eligible for a free upgrade if you purchased the system between june 26 , 2009 and january 10 , 2010. [title] Find your serial number and purchasing information.

Ending1: [step] You can find your serial number and purchase information online. [title] Install windows 7 from an ipad, ipod touch (if you have one), or a windows desktop computer (if you do not have one). Ending2: [step] If you bought from apple, this is the first step on the plan for download of windows 7. If you bought from a company other than apple, you will have the option of downloading the registry software and distributing the security updates. Ending3: [step] This is the one you will need to find your system's dashboard and running status when you upgrade your operating system. [substeps] If you purchased the operating system in 2010, you may still be eligible for a free upgrade, just see below. Ending4: [step] You may need this information during the free upgrade process. [title] Contact the people you bought the computer from.

Answer format: ending1/ending2/ending3/ending4