Cannot start Microsoft Outlook. Cannot open the Outlook window.

Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. File access is denied. You do not have the permission required to access the file (C:\Users\Admin\Documents\Outlook Files\outlookdata.pst).

This happens from time to time. First is to check your C drive has sufficient free space. Sometimes we are so caught up with work that we do not realize that our main harddisk where the windows are is full. this is due to temporary files act as memory cache taken up the space or we kept downloading files or our music and pictures files that we have been collecting has piled up the free space. (Try moving to your D drive or external harddisk or burn them on CD/DVDs).

If the outlook still cannot open. Here's the tricky part. You will need to access the Windows system registry and fiddle a bit. I will provide you with the solution. However, if you do not have the confidence to perform the task, its better to consult your IT man or you can look me up to provide you the services.

Firstly, try this option 1:
1. Click on Start Run...
2. Type in: outlook.exe /resetnavpanel

If this doesn't work, try this option 2:
1. Click on Start Run...
2. regedit
3. System registry window opens.
4. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem
5. Make a backup the "Profiles" to your Documents folder.
6. Delete the "Profiles" key under the Windows Messaging (Subsystem) key

After this, start back up your Microsoft Outlook. It will prompt you to create a new profile name. Enter a name you desire and the it will as you to recreate a new email configuration. Add that in as well. And create it with a new outlook data.

Now, open your windows explorer and navigate to you Outlook Files folder. You will see a new pst file which you have created. And in addition your old pst file. Right click your old pst file and remove the Read Only option and Apply.

Go back to your Microsoft Outlook. Under the Account Settings, Select the Data Files tab. Add your existing old pst file. Set it to default if you wish to use back the old pst file. Restart your Microsoft Outlook.

Thats it.