It might be a mouse setting ...
Go to Control Panel and open up the Mouse configuration dialog.
On the Buttons tab, there's a section called ClickLock, if my guess
is correct the Turn on ClickLock selection will be ticked.
If so, untick it, click OK and retest.
If not, my guess is no good ....
Rgds,
ScottO

"Thom" wrote in message
...
| I teach Excel to beginning students. Periodically, a student will
get
| something turned on that seems to lock the mouse button on while
selecting
| cells. They left click on a cell and then move the mouse to select
a range
| but when they release the mouse button, Excel continues
highlighting cells
| where ever they move the mouse. I have been unable to figure out
how they
| get it turned on or how to turn it off. Sometimes, even closing
Excel
| doesn't help. When Excel is re-opened, the mouse is often still
stuck in
| "selection mode". Any thoughts?
| --
| Thanks....Thom