Before reinstalling, you might want to try booting without loading any kernel extensions (seach the forum on what to type/what key to hold after power on, I always forget this one... Freudian denial, I guess
If that works, remove the killer files manually (google should cough up what has gotten installed, and where).
IF you have to reinstall and a time machine backup is at hand, just have it plugged in after the installer shuts the machine down and boots into the new install the first time.
During the run of the setup assistant (time zone, and the like) you'll be given the opportunity to "migrate" user(s) and more from a time machine volume or other sources. Here, you can select what comes over: your old user(s), applications, network setting, etc.. Do NOT migrate the unspecified other files, because that will bring the desastrous SleepEnabler with it...