Ok what version L/W was you using when things went wrong ? IT matters
The prefs folders are in diffrent places,depending on what version n How OLD. .limewire or LimeWire so in search type both, one at a time of corse
dont forget the dot on the first one.
Now Go to, Start/Search/click on all files n folders/more advanced options/
& make sure, case sensitive, is not ticked. (all other boxes should be ticked)
Now!!, Put limewire in box, (all or part of file name) & click search.
Delete everything found, including Prefetch folder, (I mean everything)
Re BOOT Your computer NOW.
Use this link to D/L LimeWire, Not download.com
http://www.limewire.com/
Peace.