I have my code as follows :-
Microsoft.Office.Interop.Excel.Application oXL = null;
Microsoft.Office.Interop.Excel.Sheets sheets;
Application excel = new Mic
Let me note that in my place, adding the c:\windows\syswow64\config\systemprofile\desktop directory didn't work.
The point is that WOW64 stands for Windows on Windows64, that means it actually applies for 32-bit programs running on the 64bit OS.
Since I have 64-bit Excel installed, the proper directory turned out to be the c:\windows\system32\config\systemprofile\desktop