Or if you want you can deal direct with Acer, as many shops will still pass the job onto them. Normally once you've called them and they've verified the fault they will collect the laptop from you and return it via courier. You could try calling them on 0870 853 1000. If you decide to do this then it might be a good idea to run the hard drive diagnostic tool for that particular make of drive if you can (
www.ultimatebootcd.com ) so that you get an 'official' error code you can quote, often cuts down the call time!