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I think that is exactly the same problem with an old CERC Megaraid i4 card
DELL not support new OS after WIN2003
Look if you can find firmware to LSILogic site ( i think not the same as DELL firmware )
If you find after look also for the drivers to LSILogic site
I have found this...
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i have found solution for windows 7 64 bits
1 - update / downgrade with 611 LSILogic firmware ( not 661 662 667 DELL versions )
firmware name is 511genRom
http://www.lsi.com/downloads/Public/Obsolete/MegaRAID%20i4/N661.zip
PCI vendor is not the same as DELL...