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If you can't make the flash stick work to install no matter how it is formatted using MS tool, UltraISO, Universal USB Installer, or another method in USB Windows 7 Installation Key Drive - Create - Windows 7 Forums then the next step is to borrow a USB DVD drive to try install from DVD. If this fails you may need to take special last-resort measures.
First would be to remove the HD and put it in another laptop it fits to try install, then when you return it to the Acer adjust it to the new hardware using Paragon Adaptive Restore boot CD I'll provide you here to boot and P2P adjust the image: https://skydrive.live.com/redir?resid=365EA77F74A302F6!21223&authkey=!ALVsvQrWSm9tzhM
If this is not practical then install Win7 to a clean HD or to a partition on another PC, save a backup image of the install to external HD using Backup Complete Computer - Create an Image Backup
You'd then boot the PAR CD to apply the image while at the same time adjusting it to the new hardware. If this was an image of just a partition it may require Marking Win7 Partition Active then running Startup Repair - Run up to 3 Separate Times to make it bootable.
When WIn7 starts up it will also swap out most of the drivers for others. You may need to supply the wireless driver to get online to get drivers while installing all Important and Optional Updates, after enabling Automatically get recommended drivers and updates for your hardware (Step 3)
The other option is to order Recovery media from Acer which is often provided free if within the early months of the one-year free tech support period.
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