after downloaded the driver when try to istall i got this massage

[root@ptvhqr r8101-1.023.00]# ./autorun.sh

Check old driver and unload it.
Build the module and install
make: *** /lib/modules/2.6.32-279.el6.x86_64/build: No such file or directory. Stop.
make[1]: *** [clean] Error 2
make: *** [clean] Error 2

[root@ptvhqr r8101-1.023.00]# lspci -v

01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 01)
Subsystem: Intel Corporation Device d607
Flags: fast devsel, IRQ 16
I/O ports at 2000 [size=256]
Memory at 50100000 (64-bit, non-prefetchable) [size=4K]
Expansion ROM at f8000000 [disabled] [size=128K]
Capabilities: [40] Power Management version 2
Capabilities: [48] Vital Product Data
Capabilities: [50] MSI: Enable- Count=1/2 Maskable- 64bit+
Capabilities: [60] Express Endpoint, MSI 00
Capabilities: [84] Vendor Specific Information <?>
Capabilities: [100] Advanced Error Reporting
Capabilities: [12c] Virtual Channel <?>
Capabilities: [148] Device Serial Number 20-00-00-00-10-ec-81-36
Capabilities: [154] Power Budgeting <?>
Kernel modules: r8169

02:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
Subsystem: D-Link System Inc DFE-538TX
Flags: bus master, medium devsel, latency 32, IRQ 17
I/O ports at 1000 [size=256]
Memory at 50000200 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Kernel driver in use: 8139too
Kernel modules: 8139too, 8139cp

i have to two enternet card:

how to solve the error

Install the firmware using the package in your distros repos.

For instance in Ubuntu/Mint/Debian:

apt-get install firmware-realtek

i have Centos 6.3 installed
when i try to install i got this msg

[root@ptvhqr ~]# yum install firmware-realtek
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: centos-mirror.magsnet.net
* elrepo: elrepo.reloumirrors.net
* extras: centos-mirror.magsnet.net
* rpmforge: nl.mirror.eurid.eu
* updates: centos-mirror.magsnet.net
Setting up Install Process
No package firmware-realtek available.
Error: Nothing to do
============

Sorry i m new user of linux
Thanks for your support

thanks your support my problem is solved

I'm having exactly the same problem as the OP. Sadly, I only have one NIC so I'm unable to get online on the system with this issue currently. I am also running CentOS 6.3. Has anyone here successfully installed this driver on CentOS? Any help would be greatly appreciated!