1. Locate the files for Lessons in Introductory Chemistry installed on your hard drive. The default installation path for these files is C:\Program Files\JCE Software\General Chemistry Collection\Lessons for Introductory Chemistry. If you installed the General Chemistry Collection to another location on your computer, you should first locate the Lessons for Introductory Chemistry program folder on your computer.

2. In the program folder there are five files that should be removed:

• Wing.dll
• Wing32.dll
• Wingde.dll
• Wingdib.drv
• Wingpal.wnd

These files may be hidden. If you do not see them in the Lessons for Introductory Chemistry program folder, select the View menu at the top of the window and select Options from of this menu.ÊA window titled Options will open. In this window, select the View tab, and then select the Show All Files option. When you close the window, all hidden files will be visible.

Select the five files delete them.

3. Next open your Windows System folder (C:\Windows\System\) , and make sure the five files listed above are present in this folder. If they are there, try running the Lesson for Introductory Chemistry program again.

If any of the five files are not present, download and extract the contents of wing.zip into your Window System folder. (You will need a utility such as WinZip to expand the file.) If you are asked whether you want to overwrite any files that already exist in this directory, say no. This zip file contains the latest versions of the five files, plus one additional file. These files are specific to the program used to run Lessons in Introductory Chemistry, so overwriting them in your Windows System directory should not affect any other programs. However, just to be on the safe side, do not overwrite any files.