Most won't replace that drive so I use the usual USB external DVDRW drive for the re-install.
Also, don't waste your time with having the wrong restore media. It's one of those real time wasting issues.
I have an Acer Aspire 5050 running Vista home premium, 100gb hdd. Here's the prob... the old hdd crashed got another (used) didn't have an OS disc but a friend did so I let him install it. Somehow he screwed up the installation or something just went wrong because it now thinks my hdd is less than 10gb..? Since I got it back I've tried loading 3 different OS discs to try and go back and format the hdd again but it WON'T read the discs! Keeps saying OS not found. I've changed boot order, f12 is enabled. I know the discs work because I put them in a friends desktop and they ran. I'm also wondering if the hdd was clean, maybe that could be what's wrong with it. I really need help with this one.