Following VBScript can be used to delete Excel Addin
Change AddIn_path to the Excel Addin file that needs to be removed
Set objArg = WScript.Arguments
AddIn_path = objArg(0)
AddIn_path = "C:\Program Files\FO PROD\SalesXL.xla"
strKeyPath = ""
oReg.EnumKey HKEY_USERS, strKeyPath, arrSubKeys
For Each subkey In arrSubKeys
'msgbox subkey
strKeyPath = subkey & "\SOFTWARE\Microsoft\Office\11.0\Excel\Options"
oReg.EnumValues HKEY_USERS, strKeyPath,_
arrValueNames, arrValueTypes
X = """" & AddIn_path & """"
For i=0 To UBound(arrValueNames)
oReg.GetStringValue HKEY_USERS,strKeyPath,arrValueNames(i),strValue
If (left(arrValueNames(i), 4) = "OPEN") Then
If strValue = x Then
oReg.DeleteValue HKEY_USERS,strKeyPath,arrValueNames(i)
'msgbox strKeyPath & "\" & arrValueNames(i)
End If
End If
Next
Next