AutoCAD LT :: Mouse Cursor Lag When Selecting Objects

The issue I am having a problem with is a mouse cursor freeze when I select an object with no command active.When I select an object, the cursor will freeze for about a second before I can move it again. When I hit escape to de-select the object the same thing happens.

This is with Acad LT 2011. WinXP. Normal operation this computer runs ACAD quite fast, no particular lags or anything except maybe when selecting to copy or move very large groups of objects, or when switching between layouts or to model space when there is a fair amount of stuff in the layout, or when regen on a large file size.

This mouse cursor lag was not always the case, but at some point this problem appeared.I have tried save, regen, regenall, closing the drawing, exiting ACAD LT, rebooting the computer.

It's very irritating, since so much of using ACAD is clicking and doing things with the mouse, that it really slows down my production, to have to get a cup of coffee every time I do a select action with the mouse.About a week ago I installed the trial version of LT 2012 to see if it was different. When I opened the same dwg in 2012 there was no lag.

I then closed this and opened the dwg in 2011, and there was no lag. So it seems that the installation of the 2012 trial version changed something in the way 2011 operated.It has been operating fine now with no lag until this morning. Now I have the lag again.When I now open the same dwg in 2012, I now have this lag in 2012 as well.

I did not change any settings in 2012 or 2011 like hardware acceleration or whatever. I just suddenly had this lag, and now I can't seem to get rid of it. Attached is a file that was made by opening ACAD LT 2011 and drawing a few lines, then saving it. No template used.On my computer with this file, I get the mouse cursor lag when I select a line.