Go to Start and type in "devmgmt.msc" (without the quotes) and press Enter
Does it show a lot of exclamation points next to your devices?
If so, go to this link at Dell: http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen
and enter your Service Tag number
Download the stuff that you see on the page and install it.
Post back with any errors that you may get, and with any devices that still have ? marks when you're done.
Does it show a lot of exclamation points next to your devices?
If so, go to this link at Dell: http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen
and enter your Service Tag number
Download the stuff that you see on the page and install it.
Post back with any errors that you may get, and with any devices that still have ? marks when you're done.