Click Start, point to Programs, point to Accessories, and then click Notepad.

You can now type any text here and save that text.

You can open existing text files and modify them and save the changes. 

How to Use Notepad to Create a Log File

To create a log file in Notepad:

1.
Click Start, point to Programs, point to Accessories, and then click Notepad.

2.
Type .LOG on the first line, and then press ENTER to move to the next line.

3.
On the File menu, click Save As, type a descriptive name for your file in the File name box, and then click OK.
When you next open the file, note that the date and time have been
appended to the end of the log, immediately preceding the place where
new text can be added. You can use this functionality to automatically
add the current date and time to each log entry.