Here you have a few links of the leading brands...
Acer drivers download
http://www.acer.co.uk/ac/en/GB/content/drivers
Asus drivers download
http://support.asus.com/download/options.aspx?SLanguage=en&type=1
eMachine drivers download
http://support.emachines.com/em/driver/
Toshiba drivers download
http://eu.computers.toshiba-europe.com/innovation/download_drivers_bios.jsp
HP drivers download
http://welcome.hp.com/country/uk/en/support.html
Dell drivers download
http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=dhs&cs=19
Packard Bell drivers download
http://www.packardbell.co.uk/pb/en/GB/content/download
Sony drivers download
http://www.sony.co.uk/support/en
Clevo drivers download
http://www.clevo.com.tw/en/e-services/Download.asp
Fujitsu-Siemens drivers download
http://support.ts.fujitsu.com/download/index.asp?lng=EN&Level1=20960&LNID=5479
Gateway drivers download
http://support.gateway.com/product/?cmpid=topnav
Lenovo / IBM drivers download
http://support.lenovo.com/en_US/downloads/default.page
NEC drivers download
http://www.nec-itplatform.com/-Products-Information-
Samsung drivers download
http://www.samsung.com/Support/downloads