Hi. I have run into a lot of problems with Acer as well, so thought I'd let everyone know (jumping on the 'we hate Acer' bandwagon is sooooo fun!)
Anyhow, firstly I have to say their customer support and service have been great, including a quick turnaround. However, the laptop itself has been the problem.
Firstly the speakers stopped working after about 3 months of having it. I ignored this because I used to run it through my hi-fi anyway. Then the catches on the lid broke so it won't stay closed now. Again, not a major problem.
Then a few months after that one of the keys on the keyboard became sticky, so when you booted the computer up, it registered this a sticky key, and tried to reboot. I couldn't clear the problem, even removing the key and cleaning the keyboard didn't help. Unfortunately this launched it into a cycle of booting, running scandisk, then rebooting. Repeat ad infinitum. You couldn't do anything to it to start it up completely.
Emailed Acer and they were prompt in replying, so I arranged citylink to pick it up and send it off. It was repaired within the week, speakers and all (which I didn't even mention), bonus.
The one annoyance I found with them though is their disclaimer saying they may wipe the hard drive, so to back everything up before it is sent off. Of course in my case I couldn't boot the computer up so couldn't back anything up! As a result they had to wipe my hard drive and reinstall windows, so I lost a years worth (about 15gb) of uni work, pictures, music etc. Luckily I had finished my dissertation a few weeks before, but it is still annoying.
So, done and dusted I thought, all repaired fine. However, last week it decided it wouldn't power up at all. The battery was fully charged, and the AC adaptor working because I tried it on my old laptop. It was working the night before, but not the next day. However no lights came on, and pressing the 'power on' button did nothing. Quick call to Acer, again fast service and arranged collection. However it's out of warranty now, so it's going to cost me £35 just for them to look at it, then they'll quote me for the repair on top of that. I'm hoping it's not a hard drive problem because again I can't back anything up since I can't start the computer up! They've had it a couple of days and I haven't heard anything, so I hope it's not too expensive and it's done quickly (and that it's not a hard drive problem!)
So the message here kids is not to buy an Acer product, and to back up your hard drive!