@rayp: No, im not confusing it with meshmixer. Although meshmixer seems to be free software it needs a lot 4 GB RAM. Also heard of meshmixer the first time here :-).
I just saw that the latest version of meshlab is developed for 64bit Win only, if I saw it right.
I am using meshlab from Apr 2014: Meshlab_32bit v1.3.3. It runs fine on WinXP(SP3) on my stonage 1.5 GB Ram PC (Well, im a stoneage guy :-)) ).
I got my version from:
https://sourceforge.net/projects/meshlab/ maybe its on github also.
Greetings
Neodumont