Hello! I installed java developers' kit today, but in c:\program files by mistake. I wanted to change it to c:\, so initially I just cut-pasted it. It didn't work, so I uninstalled it (add or remove programs in control panel). However, when I tried to delete the "java" folder in c:\, it said that some file was write-protected and couldn't be deleted. I tried to install java DK again, this time mentioning the correct destination, but it wouldn't install. I get an error no. 1721 saying that "there is a problem with this package of windows installer. A program required for this install to complete could not be run" . I am surprised because, earlier, when I had installed java (albeit, at the wrong destination) there was no such error. I also tried System Restore, but the folder "java" is still stuck there, and I keep getting error 1721. Any help would be appreciated. Thanks in advance.