Installing application in N82

hello guy's

I tried installing putty and smart movie player in my N82 but it say's certificate expired but i changed the mobile date and time to 2004 but it say's date setting is wrong and stop's installing the software. i tried changing the time and restarting the mobile and tried to install but same error. can anyone help me.

[rajhot]

Change the date to one yr back for eg: march 2007 and try it.
Install a signed version only