dell oem infoCan't Activate Windows 7 on Dell Vostro A860 Laptop!?

Recently I installed Windows 7 30-DAY-TRIAL in my Dell Vostro A860 Laptop and I tried to activate it with the cracked activators but even though the activator says that windows 7 is now activated when I go to system properties there is still the trial timer........I tried 3 types of activators but no-one works...:(
I am desperate because I tried also to reinstall widell oem infondows but still nothing.......I would like to add this:when i formatted my C: drive to install windows,there was another drive(about 14mb) and when i tried to format it too it said that the drive had important info about my OEM(DeLL)...........Dont know what to do!!!!!!!
Use HAZAR loader 1.6 to acrivate ur copy of windows 7. It wrks gr8. Bt I strongly recommend u to buy a gendell oem infouine copy of windows, if u cant afford then try the above loader to activate ur copy.
I See this TuTrial
U Can Use It

http://www.downserv.com/download/index.php?newsid=972

or This

http://www.downserv.com/download/1022-how-to-upgrade-the-windows-7-rc-to-rtm-final-release.html