When you search a driver for a specific model you always go to the HP, Dell, Lenovo, Dell site and then you go to download section and chose the model of your pc/laptop and os version and download the drivers.
The Are some handy tools for you:
Dell Tool:
Dell makes drivers driver CABs which incluse all your drivers for your model and OS. 
HP Tool:
HP SoftPaq Download Manager provides a simple, powerful way to download software updates for the HP client PC models in your environment. HP SDM can significantly reduce the amount of time it takes to locate and download updates. SoftPaqs can be downloaded in as few as three easy steps from a single user interface after initial setup.
Lenovo Tool:
ThinkVantage Update Retriever enables you to download update packages from the Lenovo Help Center Web site to a network share repository folder.
This is a search tool. You give the model nummer en os and Update Retriever and scan the Lenovo Help Center Web site for the latest driver 