Percentage Completion Bar Formula not working

Hi All,

I am really new with excel, especially when creating formulas.

Basically, there are three tabs in the Excel spreadsheet (Project Overview, Windows 7 Rollout and HR Activ Absence).

Whenever we have a new project, they need to add their new project in the project overview. Once it is done, they need to create a new tab with different milestones. When one of the milestones is complete, the percentage will go up.

If you look at HR Activ Absence tab, it is fine. Whenever you complete a milestone, the percentage will go up.

However, if you go to Windows 7 tab, the percentage doesn't go up. I think there's a problem with the percentage formula and also the percentage bar.

The excel spreadsheet is in the attachment. If you cannnot access, please let me know.