Original Source: How To View Hidden Files in Windows 7
Beginners, specifically, will find this helpful. Certain system files are hidden from you by default by Windows 7 or Vista. This is to prevent the users from removing or modifying such files as it may harm your system. But you can still view these files by changing a setting.
Open any folder and click “Organize” option. From the menu select “Folder and Search Options”.
A Folder Options window will appear. Click on the “View” tab and from the list select “Show hidden files and folders”. Click OK and the changes will be saved.
If you want to access Windows directories then also unselect “Hide protected operating system files”.
Note: In case this option doesn’t exist in the first place then follow this guide to restore it.
View Hidden Files in Windows