Hi all. Recently was bugged by the problem of my C: getting used up erratically. Everyday i'd remove some application and free space and lo! Next morning again <20MB space left on this drive.
I used the following tool to figure out the problem:
Free Disk Analyzer from http://www.extensoft.com/
Saw that the folder C:/Windows/Installer took up almost 80% of the space!
http://support.microsoft.com/default.aspx?scid=kb;en-us;290301 but as it says, they've removed the installer from here. This utility, however, can still be download from http://majorgeeks.com/Windows_Installer_CleanUp_Utility_d4459.html. INSTALL IT. Do not go and run this utility from its GUI since it doesn't give the option of removing only 'orphaned' installer packages - which is what we want to do. So, fire your command prompt, cd to C:\Program Files\Windows Installer Clean Up and run : msizap g!
PS: Cleaned up 16GB of space in 10 sec!