Don't feel alone. I've done much the same whilst trying to Dual Boot PCLOS Gnome from my Ext HDD.
You aren't completely lost. You need to rewrite the Vista MBR (Master Boot Record) - this will return you to a Vista only boot.
I did this from another Linux distro which (thoughtfully) included a 'Redo MBR' utility. But you'll need to download PCLinuxOS 2007.
However you may find another method. Basically you want a bootable CD with the utilities on it.
At least running Ubuntu from the LiveCD will give you access to your computer AND access to your Vista partitions so you can copy any data from the Vista partition.
I also didn't make the Acer backup CD when I first started. But in this case they would have been useless as you need to be able to boot to enter ALT/F10 to access the recovery program.
Finally if you have to return the computer Acer are exceptionally good. They issue a reference number, send you an email detailing how and what to return, provide a contact number for DHL, give you their contract DHL number - you call DHL to arrange pick up at a place suitable to you. All at no cost - however they have a standard charge if they feel it's a non-warranty claim (about £30) which covers the courier both ways and even if they only reset the computer to factory default it's not bad value.