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#11
You are trying to run Recovery. Read the Manual on the Support Downloads webpage for your model, trigger Recovery with the keys given. If it then won't run, it has been disabled by your other installs.
If you unhide Hidden and SYstem files at Control Panel>Folder Options>View and post back a screenshot of the folders in the REcovery Partition, we can help you navigate to the image file which can be mounted and run to reimage your factory installation. Use Snipping Tool in Start Menu to attach file with paper clip in reply box.
Otherwise locate or borrow a Win7 install DVD of any version, extract the ISO using ImgBurn, run the ei.cfg removal tool to unlock all versions, then burn to DVD or write to flash stick. Reinstall Starter with the key on the COA sticker on the computer.