It sounds like you have 2 versions of LW on your computer. Not good for the system. Often one will run in the background without any interface showing. That might explain the xtra drain on your system.

If you uninstall LW, it will only uninstall what it installed; ie: your Downld folder & preferences will remain where they are. So my advice would be to uninstall both versions. If necessary you may need to use Add/Remove Programs Control panel to remove the earlier version. Otherwise there may be an uninstaller within the LW folder. After making sure the program(s) are uninstalled, then re-install.