How to reformat the hard disk of laptop w/o recovery dics?

Reformatting will wipe the drive clean and you will need to reinstall windows, either from the rescue CD or from other media. You may be able to contact Acer and order a replacement CD and install it using the OEM license originally sold with your machine.

If it is merely a problem that programs are not running correctly or that something has corrupted the computer, see if there is a good restore point that you can use from "System Restore." This may allow you to fix the problem and remove the offending program without having to go through the trouble of reformatting and finding the replacement disk.

Finally, since you say that it is Vista, it should be a relatively new machine and it may have a restore partition instead of a rescue disk. If this is the case, there should be a utility in your programs from acer that will allow you to restore the computer to its original form. This will typically reboot the computer and handle the format / reinstall for you. It's possible your friend can't find the disk because he didn't have one.

Just a heads up, typically you can not use a rescue disk from another machine (different make or model) as it will check the hardware configuration before installing the software to make sure it matches the machine the disk shipped with. It is not serial number specific though.

Hope this helps!

if you had a friend/colleague who has vista then you could use their disc as the cd key on the laptop will work. Other than that i'm afraid you may be unable to reformat without a vista disc.

No except you contact an Acer service centre in your location.