Is it possible to find files which was created at certain date? I don't remember file name, but I know date when it was created. I am using windows 7.
If you're using the Windows OS, there's an excellent free/open-source Norton Commander clone that can do this:
In the search feature (press Alt-F7), you can turn on "Use filter" then define a new filter through the "Filter" option. From within the Filter menu, press "Insert" to create a new filter and you will be presented with a dialogue box that allows you specify a creation timestamp, modified timestamp, etc.
If you're using Unix/Linux, there's a similar tool called Midnight Commander which I'm pretty sure has these types of search features available too.
Open an explore window, browse to the root of your HD (or a sub folder of you think you know where the file might be within your HD) and enter 'datecreated:3/1/2011' in the search box [replace 3/1/2011 with the appropriate date]. This will return any file/folder modified on the date indicated.