Permission denied error while opening a file which i OWN

Hi

I have an important MS Word 2013 document which i have created few days earlier.

Now, when i try to open the file by double clicking it i get the below error

"This message can appear if a file has been saved with permissions. Permissions, also known as rights or privileges, can be applied to a file, folder, or almost any resource available from a network (printers, shares, files, databases, Web sites, etc). When a user attempts to open a resource that requires specific user permissions, this message will appear if the user does not have the required permissions.
Permissions can be set for individual users, groups of users, or for a specific computer. Usually, this message appears if you are using a network to which administrators have applied permissions for specific users and groups, or if you are accessing a resource local to a specific user's computer, but are blocked because of local permissions that have been set by that user. If you cannot open a resource on a file server or other computer on your network, you will most likely need to review your user account settings to determine whether you have the necessary permissions to gain access to the resource. If you do not know whether you have the necessary permissions, contact your network administrator or the owner of the computer with the shared resources.
Usually, this message does not appear if you are using disk drives formatted with a FAT or FAT32 file system. Drives formatted with NTFS, HPFS, or another file format that provides the ability to apply permissions, are capable of forcing this message.
Occasionally, the computer that grants users access to a network can lose the information that is used to authenticate a specific user. When this happens, the only option available is to turn your computer off for thirty seconds, and then restart your computer (you must turn off the computer to clear the cached information in the network card). Restarting may reset the authentication information that is used to grant you access to the network. If this does not work, you must contact the network administrator to have your account reset. It is also possible that the network administrator has disabled your account.
There is also the possibility that the file you are attempting to open is restricted through Information Rights Management (IRM). IRM is an alternate form of file restriction access that allows creators of a file the ability to limit editing, copying, printing, or forwarding of content. If the file is restricted and you require access to its contents, you must contact the creator or owner of the file to request that they add your user ID to the list of users who are allowed to access the file."

I have neither formatted my machine or tweaked any permissions of the file. However i am unable to open the file.

Any help in this regard would be greatly appreciated.

Regards
Avinash