Try Admin or Administrator. If you changed your administrator name, then try the name you used.
By default the tile view files are displayed in the Windows Explorer
The default size of the ntds log files is dependent on the server version. In Windows 2000, the default size is 10 MB, while in Windows 2003 the default size is 12 MB.
No it does not
You need to change your Windows Defaults. This option is found in the Control Panel. You can choose which program to open files with by default. It sounds to me like all your files have a Windows Media Player Default setting on.
C:\Windows\
Program Files Program Files (x86)
c:\windows\system32
No. Certain files are hidden by default. You can reveal them by opening any folder, clicking on tools, folder options. View Options, view hidden files and folders.
Go away, nerd.
lnk files aren't opened by any program. They are processed by windows to open another program or file. They are shortcut files. They don't need a default program
Data files for what? The system? Undoubtedly that'd be the system32 folder, but your best bet, look in the C:\WINDOWS\ folder for all of them.
The Default location of Outlook PST data file in Windows 7 is:C:/Users/COMPUTER_NAME/Documents/Outlook Files/YourEmailAddress.pst