You can use Microsoft OneNote 2007 with Windows 7 to write down notes. OneNote offers a free-form canvas where you can type, write, or draw notes in the form of text,
graphics, and images wherever and however you want them.
Refer this link for more information:
http://office.microsoft.com/en-us/onenote/HA100325701033.aspx
Additional information:
http://www.microsoft.com/windows/products/winfamily/mobility/articles/onenote.mspx
via Problems finding note-taking software for Windows 7 Tablet PC – Microsoft Answers.
