Use windows update, it will automatically locate missing drivers (sometimes it does not work).
Windows Vista bundles drivers for the Realtek 8169 chipset, so you are unlikely to need to download them. They are available on Realtek's support site (in the Related links section below).
RealTek Audio Druver
There is not a way to upgrade Windows 8 release preview to Windows 8 Enterprise Evaluation. You will need to install Windows 8 Enterprise Evaluation in order to use it.
Typically the latest drivers are the best Realtek Drivers available. The driver in question would depend mostly on your hardware. Such as your soundcard and speakers. The latest version is currently R2.71 which is available since May.
One can find information on Windows Vista Enterprise from many places. For instance, the official Microsoft website, BayconGroup, and PC Support all offer information on Windows Vista Enterprise.
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A generic driver for the RealTek RTL8139D can be found at the link below. Note that Windows 2000 and later should already include this driver by default. You can also visit Getdriversnow website and download free driver for Realtek ethernet driver. Just follow the link below.
Microsoft has released the windows 8 enterprise version.
If you are running Windows xp mode on Windows 7 professional, ultimate, or enterprise
I just solved this problem by installing the correct version of "Realtek HD Audio Driver" for windows 7. my old version of realtek hd audio driver was for win xp. I removed it, and downloaded the correct updated version for win7, then installed it. problem solved.
In case you have Windows 7 Enterprise (x64 or x86) It is actually not that difficult to flip from Windows 7 Ultimate Machine or VM to Windows 7 Enterprise (you just need to modify the registry keys to reflect it), and then use the Windows 7 Enterprise DVD to run an upgrade.First you should of course backup your data.Here is a quick hack to make the Windows 7 installer DVD think you have Windows 7 Enterprise already.Open regedit (Start -> Run -> regedit )Locate HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current VersionEdit two keys to say ProductName and EditionID to say "Enterprise" instead of "Ultimate" respectively.You should now see Enterprise and Windows 7 Enterprise as values on this page.Insert your Windows 7 Enterprise DVD and run an Upgrade install.Open a Command Prompt and Run "C:\Windows\system32\slmgr.vbs -ckms" to clear any KMS serversOptionally clear your product keys with "slmgr -cpks"Run "C:\Windows\system32\slmgr.vbs -ato" to register with your Enterprise Activation server
Ultimate and Enterprise