here i am answering my own question to my problem. For those who are stuck with the ethernet controller lan driver in windows 7 if you install the xp and it doesnt show up in device manager after restarting goto update driver and point to the xp folder you downloaded from acer downloads. Your computer will need to restart and then should show up in device manager no problem if have any problems installing ask me and i will instruct on installation.
I recently installed Windows XP on HP Pavilion Slimline s3400f PC which uses realtek RTL8201CL on-board ethernet adapter. I can't find the driver anywhere. Not even at HP website. I tried the driver for Windows Vista but it wouldn't install. Any help will be appreciated.