Windows 98 SE (Corrected) [Blank window overlay on desktop]

This is a repost with a bit more claritiy.

I am running Microsoft Windows 98 SE

My computer runs flawlessly with the following exception.

When the computer boots and arrives at my desktop, the desk top boots well displaying all of the correct Icons. The desktop also works well. What appears is a "blank window" which overlays the Desk top. A Blank window opens displaying its source as C:\Program files\Common.
This problem began after updating my Norton Anti Virus subscription. In conversation with Norton the tech’s that I’ve spoken with plead ignorance.

I am using a Gateway computer..
Microsoft Windows 98 4.10.2222 A
Authentic AMD AMD Athlon(tm) Processor
128MB RAM

Can anyone diagnose the problem and offer me a way to correct the problem?

WinFan