Click on my computer icon on desktop, when the wizard opens, you can see 'Search' icon under the control menu. Beside of folder icon.
If you can't go through my computer then press F3 key on desktop. The search window will open.
There're many options like pictures music videos, Documents, all fines and folders, computer or people etc. Click on the icon which belongs to your type of file.
Type the name of file in the search bar and then click on the drive where you want to make a search.
After clicking on search icon. Your computer will search the file and show it. If the file is not in that drive than choose another. If you're forgetting the name of file than type the name come close to that file and search. Many files will show up and you can identify your.