Error: AutoCAD is not installed properly...

You get the above message, or a variation of it, when you start LT for the first time, or at some point later on.

LT2006 and higher started using .NET framework from Microsoft as part of the CAD program, and with the evolution of both .NET and LT, as well as many other programs on your PC, your PC may have reached a point where the clutter is causing problems.

Autodesk provides the following Knowledge Base document to resolve the issue HERE. ◦

Error: AutoCAD is not installed properly...

DWF vs. PDF

There really is no choice, you do what is needed for the task at hand, PDF if it's needed, DWF if it works.

However, many AutoCAD/LT users see this as a single-view choice, not grasping, or perhaps fearing, the true power of DWF over PDF.

How about a free viewer that will allow a user to electronically comment on and/or measure content in those files and return to the file originator for an update? Yes, your file recipient, aka the Client, can receive your drawing(s), review it, redline it, and send it back to you to make those important changes.
No, we are not talking about DWG files, or PDF, we are talking DWF. All they need is http://www.autodesk.com/designreview, which is free, and all you need is LT2008 and higher, you can Xref their DWF back into your file and pick up the markups in your DWG file.

But they already have a PDF viewer installed you say, and they fear installing a new program? They don't wish to redline, just look at a file and comment in other methods? Or just look at progress sets? There is a free online viewer, a webpage they can go to, click on the browse button, and open your DWF file with (they can even use their PDA or web-capable phone to do this), click HERE or share that link with them when you send the DWF file.
For the "cutting edge" version of the above, click HERE.

Communication is a powerful business tool, clients respond to it if you bring it up as more than 'just another software package' to try. Give them the power to review on the go, without leaving their PCs or mobiel devices, you do the same. ◦

DWF vs. PDF

Commands and Variables List

AutoCad and LT provide a list of almost all commands and variables in HELP: while in LT, type HELP or click on Help in the Pulldown Menu or Toolbar Button. Click on the Contents Tab, then click on the + sign next to the chapter labeled Command Reference.

For a more comprehensive list that covers all current versions of LT and AutoCAD, click here for Commands and here for Variables: note that these include full AutoCAD commands that may not be available in LT, as discussed HERE. ◦

Commands and Variables List

XREF Keeps Moving

Opening a file with an Xref, or Xrefs, after saving may appear to be moving/relocating on their own. Explore INSBASE and UCS commands as the most often fix that works:

Both the value of INSBASE variable and the current UCS need to be consistent in both the source and target file(s). The easiest way to keep all of this straight is to set UCS command settings to World and INSBASE variable setting to 0,0,0.
Use 0,0,0 as the insertion point when you INSERT the Xref. The same if you are creating an external block with WBLOCK command. ◦

XREF Keeps Moving

Dialog Window or Command Pop-up missing

You start a command like OPEN or SAVEAS, and instead of a pop-up to select file location and name, you get prompted at the command line to manually enter the information.

FILEDIA variable is turned off: at the command line, type it and when ask, type 1 (one) to turn it on. This variable is designed to suppress display of file navigation dialog boxes if set to 0 (zero).

It affects many other commands, including BMPOUT, CUILOAD, CUIUNLOAD, IMPORT, JPGOUT, NEW, OPEN, PNGOUT, PUBLISH, RECOVER, RECOVERALL, SAVEAS, SCRIPT, TIFOUT, VSLIDE, WBLOCK and XREF among others.

A similar variable, CMDDIA, used to affect more commands in older LT versions, but in many of the latest versions only affect QLEADER;s in-place text editor. ◦

Dialog Window or Command Pop-up missing