Could not detect LAN connection after reinstalled win 7, same os as before

possible dropped out the LAN driver
good bet if you are using win xp or win 7 OS

In Win 7 , First , Install ALL Windows updates and Acer updates. Shut down the machine and unplug, remove battery, plug in, reboot. THEN, Open the Device Manager, Scan for Hardware Changes. Did it come up at reboot? YES/NO? If no, Select YOUR OS, 32 or 64bit and Download the wireless lan driver at : http://support.acer.com/us/en/product/default.aspx?tab=1&modelId=2438

I suggest staying away from BIOS flashing. Last thing you want is a brick.

In Win 7 - Go to Start > Control Panel > Network and Internet > Network and Sharing > Manage network connections. Enable the wireless card.

In XP - Go to Start > Control Panel > Network Connections. Enable the wireless card.

Win 7 will use more resources and make it slower. It is a nice netbook, but still a netbook. Plus you need to consider drivers for, LAN, sound, and video.

Try testing with Win 7 advisor,
http://windows.microsoft.com/en-US/windows/downloads/upgrade-advisor

your down grade is the problem
win xp and win 7 are no longer supported by Microsoft so any blips in the loading process are not fixed on line
Microsoft are pushing hard for everybody to use win 10 and company statements are saying that win 8 and later version will also not be supported in a few years time
it is possible that in downloading the driver from the manufacturer site (best idea) it is possible that you missed the bit ( suitable for win os win 7 ,8 vista, 10 ) that win xp was not on the list

Routers don't need drivers. You connect to it via LAN using a LAN cable.
For further instructions, check manual at http://www.netwood.net/support/manuals/D-Link_DI-604_manual.pdf

Hi,

Since you have reinstalled the OS, while formatting the drivers for teh desktop card is also uninstalled.So please install the drivers for the LAN card again.

THANKS....
With Regards......
Vaishu

Ok, unfortunately, even though, you had two partitions they were both on the same Physical drive, now you cannot "Format & Partition" without breaking the install, as the Win 7 is the "Boss" and when you formatted you have wiped out all you boot track information, You maybe have a shot, if you get a Win 7 install disk, and boot off of it, then ask it to repair your "Boot Sector" this may allow you to Boot into Win 7,if you are lucky. Then you can use as normal. But if you cannot do that, you will have to boot from a Win 7 or Vista or whatever OS you wish to install,and follow the instructions, and do a complete reinstall of the OS. If you wish more than one partition, in the setup, it allows you to choose the size of your drive, so simply do all that, at that time.

Hi
Try to reinstall the driver software and do a system restart as well which makes sure that the OS recognizes the LAN. If this does not work then try downloading the latest realtek LAN software for Win 7 from the below link:
http://drivers.softpedia.com/get/NETWORK-CARD/REALTEK/Asus-M4A77TD-PRO-Realtek-RTL8111C-LAN-Driver-735222009-for-Win7.shtml

I DONT KNOW MY LAN CARD ID