Trouble after changing harddrive  

Hello! I have a problem after I changed my harddrive AND installed windows 7 home premium on my laptop. I can not get access to the internet, it only says "Install a driver for your network adapter. Windows did not detect a properly installed network adapter." What?? I cant find any network devices in device manager either. What do I do? I have a Acer Aspire V3-571 intel core i3-2310M. Internet was no problem before I had to buy a new harddrive and install Windows 7

Thank you for answering quickly! But im norwegian, so there were a fem things I didnt quite understand correctly, I think. I bought the windows 7 package at PC World, so I should just bring it there then? Theres nothing else I can do?

Thank you! When I go into Other devices I find these: base system device, ethernet controller, network controller etc. In the ethernet the hardware Ids are: PCI\VEN_14E4&DEV_16B5&SUBSYS_06471025&REV_10. Is that helpful info?

I figured it out now, and now have internet!. Thank you for all your help! BUT, now I have another problem. I cant seem to get the HDMI to work anymore, it only says "no signal" on my LED TV. Do I need a driver for that to work as well? I cant seem to find any HDMI-driver on the website. Here is the link to the Acer-site: Download. As mentioned before, I have a Acer Asus V3-571

Never mind, I've fixed it! Thank you anyways. This site is great!

If all your problems are solved make sure to mark the thread as solved.