Since the vCenter now requires a 64 bit operating system to install, the DSN must be upgraded as well to support the 64bit application. Currently vCenter 4.0 and older all required a 32 bit DSN. To change to the proper DSN you will need to remove the old one from the 32-bit DSN application and create a new DSN.
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Remove the old DSN if it exists from:
%windir%\SysWoW64\ODBCAD32.exe -
Install the 64 bit SQL native client from: http://go.microsoft.com/fwlink/?LinkId=123718&clcid=0x409
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Create a new DSN from the utility in Administrative Tools or here:
%windir%\system32\ODBCAD32.exe(this is the 64 bit version) -
Install vCenter and get rocking and rolling.