OH Boy a fella that knows it all. To begin with explorer.exe is stuck in a loop and by the way it does mater how much mem you have. I have one machine with 1gig and if I run several programs at once and open explorer and make it do 3 or more simotanius searches it will get stuck in a loop. Oh and bye the way you can do this weather LW is running or not. On the other machine I have 2gigs guess what I have to have allot more applications running to make explore.exe get stuck in a loop LW running or not. I have been testing this for a while now and as far as I can tell it is directley CPU and MEM related. LW is mem intensive but not crippeling there may be a bug and there may not but you have no Idea what causes the problem or any Idea of a soulution so maybe you should keep your oppinions to yourself if you have no IDEA of what you are talking about. The person who made this post was asking for help not sarcasim. Now for what help I may offer and it isn't much open task manager see how much mem is being used and by what if you are using pretty much all your mem you can shut down some of the programs running in the background it should help a little. A little more Info might help also such as

What O/S 98/2000/XP
CPU ghz
Mem 256/512
Java Version
LimeWire Version
And anything you notice when the problem occurs
How many applications you were running and what they were

Latter Grandpa