How to reuse Trial software?

When I install "Trial Version" of software.
It will let's me use for example only 10 days.

I sure can not use it after 10 days.
But I have uninstalled it after 10 days.
Then I reinstall it but the Program know that I already used it for 10 days.

My question is, how can I reinstall it and I can use it from day 1 again.
I mean to let's that program don't know that I use this program before ???

Thanks in advanced
Who is Participating?
Lee W, MVPTechnology and Business Process AdvisorCommented:
Well, if we told you that, you'd be stealing the use of the software - if you like it so much, buy it.
b0lsc0ttIT ManagerCommented:

If you need more time in your trial period the correct way to get it is to contact the software company and ask them.  Any other method would most likely be against the license agreement and be considered hacking, which is against the member agreement for this site.

Removing a marker from your system, such as a registry key, hidden file etc etc used by software vendors to identify previously installed trial versions, then reinstalling is pretty cut and dried; how can it be illegal to remove info from your own PC?! It may be immoral, but I doubt it's illegal, unlike using a crack which is almost certainly a violation of the EULA(not in the UK anyway - plenty of crazy USA laws that might cover it though).

However I think you'll find you have almost zero chance of finding out what it is they do, short of using snapshot or reg/filemon software to monitor the installer activity.

Best bet is either buy it or find an open source alternative; there are plenty you know, and most of them are just as good if not better than proprietory equivilents.
akkhaAuthor Commented:
Thank you for all comments!
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