tharkun's answer is correct, but I just wanted to post a “more correct” answer for anyone who finds this question in the future.
For some reason, Eclipse needs administrator privileges on Windows 7 and Windows Vista machines. To do this once, right-click the Eclipse executable or shortcut and click Run as Administrator; to make it permanent, go to the properties, compatibility tab and check the box "Run this program as administrator".
Despite the Tarkun position, he may have forgotten that Eclipse has no installer; you just unzip it. No reinstallation required. If you usually start Eclipse and find something wrong and just found this answer, you can safely run Eclipse as an administrator from now on and nothing will be broken as a result of not starting the administrator to this point.
Problems with Eclipse that require administrator mode are not immediately displayed, but, for example, if you check for updates with Eclipse running in non-administrator mode, Eclipse claims that there are no update sites available. Also, some GUI features will have problems.
These problems are probably caused by some advanced UAC features designed to protect your system, such as UAC Virtualization . Eclipse can (and hopefully will) be fixed to write only in user space and "play well" with other Windows applications, but for now we just need to run it as an administrator and hope that it does not take advantage of the added privileges.
As a side element, I just spent a few hours trying to figure out how to get Eclipse to write inside the% AppData% directory, hoping that it will solve this problem and allow Eclipse to run in user mode, but I could not force Eclipse to comply with everything that I tried it. Oh good...
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