1 year ago I had a trial run on a program and unistalled it and its registry entries. Why is this remembered?

The only way I have been able to do that is to install Windows from scratch. In the "C:\windows\command" folder is a prgram called Deltree.com, copy it to an external device and run it from there. "deltree /y c:\windows", it will delete the entire windows directory and all of it's subdirectories.

You can then reinstall Windows.

This is remembered because what you used was a trial, not free software. Once you've tried it you have to either pay for it or stop, not just uninstall it till the next time you want to use it.

You will not find this registry entry. It will be called something obscure that is not obvious from the name of the software and manufacturer. It will not look like a date but instead will look like a random string, number or binary data.

It is not doing anything to your PC so just leave it.

My advice is to let well enough alone it is taking up little or no space on your PC messing with the registry can make trash of your PC a repair could be as expensive as a replacement.

Be Careful.

Sorry but this is impossible, the trial programe comes with too many binary codes thats why when you try to re-install it it tells you the trial as run out. you have to re-install windows to get it to work again.

I shall watch for answers on this very carefully, because I also tend to do similar things, thinking how clever I've been to remove all trace, only to find that somehow, somewhere it still exists. Probably not on our actual computers, but if its, for instance a Microsoft prog. they know EVERYTHING. No fooling people these days.