Having your stuff well organised in a database is great, but you have to find it all first!
This program will index your computer as you wish, and allow you to find anything quickly;
website link;
http://www.searchinform.com/search-site/en/main/full-text-search-download-free.html
It is free for personal use. It allows full text searches in PDf files, texts, images etc etc etc.
Very good if you have a lot of data.
TL
MC