Right Click in your "Search Folders"
Click on "New Search Folder"
Scroll down and click "Create a custom search folder"
Click "Choose"
Click "Criteria"
Click the "Advanced" Tab
use the "Field" Drop down
Select >"All Mail Fields"> "In Folder"
Set condition to "Is(Exactly)"
Set value to "Inbox"
Click "Add To LIst"
Click "More Choices" Tab
check the "Only Items That Are Unread" box
Click "OK"
Name your Criteria (ie. Inbox-Unread)
Click "OK"
Click "OK"
You will now have a new search folder that only shows Unread Items in your Inbox