Win95 ‘File Type’ tab is gone.

Have a 95 workstation and for unknown reason the ‘File Types’ tab is gone ie
1. Open my computer
2. View > Folder options

There is no file type tab. This also, I believe makes it impossible to create a New document with the right-click of the mouse on the open desktop. Any ideas? This may have happened after installing Adobe Acrobat 4.0. Already looked at both Microsoft and Adobe sites to no avail.