WordStar 3.40-1.0 problem in Windows 95B/98

I have a problem, but maybe it is a simple well-known one and you or someone else you know could help me solve it.

I am still using an old version of WordStar (3.40-1.0) on a Pentium computer.

On a computer where Win95a is installed, I exit from Windows and run WordStar and it works.

On the two other computers where Win95B and Win98 are installed, I exit Windows and run WordStar but it doesn't work. WordStar looks for the disk in the A: drive and then it gives me the message "@@@" (even if I insert a
disk in A: with its program files). I have then to press the "X" key to exit.

Also WordStar looks like it is working under the "Ms-Dos Prompt" window of Windows (any version), but basically all I could do is print files, because I can not save any modification (I open a file, write something, save it
but when I open it again nothing new has been saved).

I would like to know if there is any way to make the old version of WordStar working either after exiting from Windows, or in the "Ms-Dos prompt" window of Windows, or both.

Can you help me? Should I send a message to WordStar@cue.com?

Thank you in advance for your help.
Best regards,
Giovanni