I came across this error while I was trying to upload documents in my newly created document library with “Open with Explorer” option.
After doing some Google I figured out that the main reason for this error to come was that “Desktop Experience” feature was not installed on my Win 2008 OS.
Now below are the steps copied from MS site for Installing the Desktop Experience feature
To install Desktop Experience using the Initial Configuration Tasks Wizard
1. In the Customize This Server section, click Add features.
2. Select the Desktop Experience check box, and then click Next.
3. Complete the wizard by clicking Install.
To install Desktop Experience using Server Manager
1. Open Server Manager: click Start, point to Administrative Tools, and click Server Manager.
2. In the Features Summary section, click Add features.
3. Select the Desktop Experience check box, and then click Next.
4. Complete the wizard by clicking Install.
At this point your system requires a restart and after that when you try to use the feature of “Open with Explorer” of document library, it wont give you error.
And if incase after installing Desktop experience feature you still encounter the same error then better check the Web Client service. Enabled it if incase it is disabled. This error will hopefully fly away.
Happy Share pointing
