I though the problem was with aptana installation. Even that does not allow a graceful uninstallation as it greys the uninstall option in software updates. I manually searched and found and deleted each and everything with name aptana written on it from my machine.
Downloaded the complete version of eclipse and ran again into the same access denied problem. Sometimes it says connection reset by peer, some other process fighting for the same port on windows.
How do I discipline eclipse becasue the same application works perfectly fine from command prompt?