Class not registered VB Applications Excel

One of the program design in Excel and its run on VB Applications .One of the window 7 system when open this file error given

Class not registered.
Looking for object with CLSID:{AC9F2F90-E877-11CE-9F68-00AA00574A4F}
actual error message screenshot given below 

but same application or file work find on another system so code is fine issue in specific system where its not open correctly..

Solution of this error which is work first this error caused by  missing or incorrect Microsoft Windows registry entry for the Dynamic Link Library Fm20.dll. so first download fresh  Fm20.dll 

Then copy dll file in the Windows\System folder or in the Winnt\system32 folder (under Microsoft Windows NT) .generally copy C:\Windows\System32

after copy Close all open programs

Now need a Register  Fm20.dll

open command prompt with administrator rights then give the below command and press enter

Regsvr32.exe fm20.dll

after press enter. The following message should appear:

DllRegisterServer in c:\windows\system\fm20.dll succeeded.
if succeeded message appear then dll registration successfuly.

now it will working without any error.