Hello Headshot, and welcome to Seven Forums.
Advanced search is gone in Windows 7, but you can still open a Search window by pressing WinKey+F
. It's the same as using the seach box in Windows Explorer.
You will need to have hidden files
set to show for them to be included in the search results.
You might also set your search settings in Folder Options like below for more detailed and accurate results as well.
Hope this helps,