Hello
Welcome to the Autodesk/AutoCAD Forums !
If your Lenovo " 3000 N 100" is this one :
Processor : Core 2 Duo T5500 - 1 Ghz - RAM: 512 Mb DDR2 - HD: 80 Gb - Win XP Home
First, an OLD Core 2 Duo at 1 Ghz is SLOW !!
Sorry but (for me) NONE ACAD / ACAD LT can run on this very old PC ... especially if you have ONLY 512 Mb !?
With Win XP you must have 2 Gb to be able to run ACAD / ACAD LT 20xx-2014 ...
I have an old Win XP PC with 1.5 Gb, so it is possible to run ACAD 2004-2014 on it
but I get only about 900 Mb to run all my Windows programs : ACAD, Outlook, Winword, Excel, IE/Firefox/Chrome, Acrobat, etc ...
ACAD 20xx-2014 can start on a PC with ONLY 1 Gb BUT you will be able to load SMALL DWGs ONLY ...
So how much memory on your PC ?
Patrice BRAUD