Ok, I would try using a great tool called "gparted". Gparted is a linux platform that you boot from.
First off, download the gparted .iso file from here: http://sourceforge.net/projects/gparted/files/gparted-live-stable/
- click on 0.5.1-1, download the .iso file
Secondly, once that has downloaded, burn the image to a disk using nero, poweriso or other similar .iso burning software.
Next, pop the disc in the drive of the computer you want to format, restart the computer and enter the boot menu. On Acer laptops I believe the boot menu is accessed by tapping F12 on boot up or the ESC key. When the boot menu appears, select the CD/DVD Drive which has the gparted cd in it.
Gparted will begin loading. Leave everything at default. When it gives you three options, 0,1 and 2, choose option 0.
Once gparted has loaded up you will be presented with a basic "desktop" type environment and a window open in the middle, which lists your hard discs.
From there its quite self explanatory how to format the disc. Make sure you format it in NTFS rather than the default file system in gparted which is Ext3..
Hope this helps