Microsoft RMS and Mercury and Windows 7

I've installed RMS on other Windows 7 machines before but I'm running
into some trouble with one client's machine. The machine is a Dell all-
in-one with Windows 7 64 bit (updated with all new hotfixes and
service packs). When I install RMS, I receive a lot of errors
regarding trying to register specific DLL and OCX files. The install
will finish and the program will run fine, but when I try to install
the Mercury Payment gift card addon, the installer gives me this
************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance
of an object.
at RMSMPSReg.frmMerchInfo.frmMerchInfo_Load(Object sender,
EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Control.CreateControl(Boolean
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32
msg, IntPtr wparam, IntPtr lparam)
And then it lists all the loaded assemblies. It gives the options to
quit or continue. Quitting ends the install obviously, but if you
continue, the next screen that asks for the merchant ID number will
pop up and you can enter the information, but when you click OK it
says something to the effect of "reference to an object not
initialized" or something like that, and won't let you continue.
Everything still works but the gift card module does not.
I tried uninstalling the program, and writing down all the filenames
it said it was having an issue registering and tried to manually
register them using Regsvr32 but it wouldn't let me register them
I did everything under an administrator account. I called up Mercury
and they said it was beyond their knowledge and that it was a
Microsoft problem. Any ideas?
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I went to uninstall the Mercury addon and it said I might have to manually uninstall the hooks. I went into Regedit and RMS had not made any changes to the registry when I installed it. Is there a way to fix this?
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