VBA Enter Password To Protected Linked Files

I currently have a problem when retrieving data from an external document that is password protected. The below routine causes Excel to request the password to the file multiple times. Using the 'SendKeys' function provides a slight workaround although I am very keen to remove this. It also doesn't appear to update links once the routine has run though a couple of the 'For' loops.

I have it set so that the user has to input the first password request, but the 'SendKeys' simply hits enter for the rest of the requests. This doesn't stop the cells from being updated for the first run of the 'For m' routine but can fail on the following runs. Sometimes the second loop works, sometimes it doesn't and the user will have to manually update the links through the 'Edit Links' tool.

I tried turning Application.DisplayAlerts to false after the first password request but that didn't stop it from appearing. If it had, I was going to use the ActiveWorkbook.UpdateLink Type:=xlExcelLinks command to allow the user to update the links at the end.

Code:
Private Sub CommandButton1_Click()
'Application.ScreenUpdating = False
Dim d, m As Integer

[Code]....