So, I realized today that I need Powerpoint for school projects and decided to try the trial. I downloaded it from MS's site and installation was fine. Then when I launched PowerPoint, it asked for my serial and I pasted it from my e-mail but it didn't work. I tried everything and decided to uninstall the whole Office (I used uninstaller which came with Office). Reinstalled and it accepted my serial now, but when I try to open any office app, it says "Defective installation, run installer to solve problem". I ran it few times with no success, so I uninstalled it again. I also deleted all MS files which came with Office. Rebooted and downloaded a new trial with new serial. Installed okay but same problem occurred again. One thing came to my mind, installer said you need ~1.2GB free space but when I reinstalled, it only needed 900MB, so are there some hidden files somewhere which are defective? I'm not in a big need of this because my Acer has Office 2007 but I'd like to use my iMac instead of it because it sucks.