Is OS 7 32 or 64 bit on both machines?
Is Office/Excel 2010 32 or 64 on both machines?
Are you both using GridView X32 or X64?

There was an issue with GridView X64 hooking to Excel 32 that will be address in future releases.

For the brave you may try "tweeking the registry"

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\CLSID\{00020812-0000-0000-C000-000000000046}]
@="Microsoft Excel Application"
"AppID"="{00020812-0000-0000-C000-000000000046}"

[HKEY_CLASSES_ROOT\CLSID\{00020812-0000-0000-C000-000000000046}\LocalServer]
@="<path on your system>\\EXCEL.EXE /automation"


Changing <path on your system> to something like

C:\Program Files (x86)\Microsoft Office\Office14