complete un-installation

hi there!
[I]Few years ago, I installed a media player software (trial version for *0 days) on my pc, windows XP, SP -*. After the trial period expired I decided not to purchase the full version because it was not so much useful for me. I un- installed that program.
Some days later, I got a CD from my friend that needed that software (which i un - installed) to display files. I thought, I should install that software again to get one more month of trail. But to my surprise the program messaged that your trial period has been expired. Then I come to know that[/I] [B]even after un-installation the program stores information that it has been installed previously, somewhere on the computer[/B].[I] I scanned registry, log files, etc. but did not get rid of this.[/I] [B]could any body tell me how to fully un install the software and where does it stores information which resides even after un-installation? [/B]

What is the name of the program, version ect.

You could format; change date on your computer;or try this [url]http://www.nirsoft.net/utils/run_as_date.html[/url]