Thanks for posting!  You probably have two driver files in c:\windows\system32\drivers.  It can be tricky to figure out which one is the newer of the two, but if you remove the older one, that should fix the problem.
Hello, I have a 1750 that i just rebuilt with 2003 server.   I updated it with the SUU 5.5 so all the drivers/firmware are up to date.    Driver in device manager shows version 6.46.2.32 for the PERC 4/Di.   OMSA (Version 5.4.0) shows a driver version of 5.48 under storage->perc 4/di->firmware/driver.   I tried OMSA 5.5 but had the same problem.   Is there a patch for 1750s and OMSA?   I noticed there is a patch for another server (sorry I forget which model...1650's maybe?) that seems to address a similar issue. Thanks, Justin
1750 - OMSA reports wrong PERC driver