You're using the wrong driver.  The one you linked to says it is for Server 2008 x86.  Since 2008 R2 is 64-bit only, there's no way it will work.  Use this driver for 2008 R2 (you have to change the dropdown menu on the Drivers/Downloads site to the correct OS): www.dell.com/.../DriverDetails Be sure to run it first to extract it, then put the extracted contents on your CD/DVD/USB for use with the Load Driver link.
I have the Dell PowerEdge T110 II server with the PERC S300 RAID card.  I've installed 4 HDDs & configured them to RAID10 in the initial setup.  The motherboard does acknowledge the PCI-E Card, which in turn does acknowledge the drives. I pop in the Windows Server 2008 R2 DVD and I boot from DVD, however when I get to the part where I have to chose a file location, it appears that there isn't a drive available.  There is another option to add a driver.  So I've gone to the website ( [URL] downloaded the appropriate driver, added it to USB & when I get to that screen, I attempt to add the driver.  However, it tells me "there are not signed drivers available in this folder".  Does anyone know what I might be missing?
Driver issue: Windows Server 2008 R2 on T110 II server with PERC S300 (RAID10)