Please help me fixing internet download manager

hi all ,,,, i seek real help i have installed IDM for free for 30 days trial and it ended for that i tried to register it with fake serial number and when i did so it kept this number and telling me that you have registered with this fake number and the message reads i cannt use it any more i have done many solutions to get it work again but all in vain i have uninstall it and install new copy , went to delete it from registry and many others what to do now dear members experts take into consideration iam using labtop toshiba windows 7 original home premium .>>>>>
 
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