See if you can boot into Safe Mode
with networking to install Malwarebytes
, run a full scan. If no Safe Mode, download, burn to CD or write to flash stick, boot and run Microsoft Standalone System Sweeper
After cleaning up infection, boot the DVD to second screen to choose Repair My Computer. Use the correct bit-version - it should prompt you if you use the wrong one. Then run Startup Repair repeatedly, report back results.
If you cannot repair then try running Acer factory recovery: Acer Support: Recovery media and Restoring a system to factory load
Since your computer is only 7 months old you still have the one-year free Tech Support. Acer can help walk you through Repairs, running Recovery or provide Recovery Disks if needed.
You did not need to buy new Windows 7 for the Acer as you own a copy for the life of the computer. To unlock the licensed version on the COA sticker, use ImgBurn to extract the ISO from the Pro DVD for the correct bit-version (32 or 64), then run the eicfg removal tool
on the ISO, burn an all-versions installer to DVD using ImgBurn at 4x speed. Boot DVD to clean reinstall the licensed version using these steps to get a perfect reinstall: Reinstalling Windows 7
If Windows 7 won't boot to install, enter BIOS setup to reset to defaults: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS.
Next test the HD using maker's HD Diagnostic
extended CD scan which can also wipe the HD afterwards to clear the boot sector.