When you buy a new PC then it should always be delivered with a Drivers & Utilities CD/DVD included. If that is not the case, then you should contact your local helpdesk and ask then to send you one. Don't wait too long before calling though.
If you have an older model, then you should be able to find drivers on this site: http://www.fujitsu-siemens.com/support/downloads.html
. When you enter your serial number it should find drivers for your system.
If that does not help, then you can search for a driver by entering (part of) its name in the Full Text Search, so you should try to find out what the specific component is.
If you are still unable to find anything, you might try posting your serial number and specify which driver you are looking for.