1. How to use service ?
For searching a driver you need to type required info in the "Search for driver" line. For example: PCIVEN_8086&DEV_2983&SUBSYS_82761043&REV_033&11583659&0&11. This info could be obtained by choosing "Information" bookmark in drivers settings. The code of devices example.

2. Is it possible that driver file can be infected with virus ?
No way, it is impossible. When adding new files, all of them are checked with last antivirus systems.

3. How can I add new drivers to your database ?
You need to visit "Upload" page.