Audio lost after system restore

Hello,

Have a problem that after system restore I lost audio and the driver scan I used tells me it has to do with the absence of Realtek RTL 8102E/8103E family PCI-E FastEthernet NIC, installed on 2008 5.708.1030. The driverscan appoints an update 5.782.0114 of jan. 13th 2011. The scan also tells that the Audio Device on High Defination Audio Bus is not installed n/a and gives as its update 5.10.0.6167. My mainboard is a Biostar 945GC M4. I downloaded a couple of free audio drivers but non will install. My Computer knowledge is very limited and requires a more detailed explanation. Anyone to offer help will be much appreciated.