Situation:
When using Norton AntiVirus (NAV), you see the error message "Terminating thread due to a stack overflow problem. A VxD, possibly recently installed, has consumed too much stack space. Increase the setting of 'MinSPs' in the SYSTEM.INI or remove recently installed VxDs."

Solution:
This is usually caused by a Windows setting that is set too low. 

To resolve this problem, you must make some modifications to the Config.sys and System.ini files, as follows:

1. Restart the computer.  Press F8.  Choose Command Prompt.  

2. At the C:\ prompt, type EDIT CONFIG.SYS.
3. Add or modify the following entries so that they are set to at least the following values:

FILES=150 (set to 200 if on a network)
BUFFERS=80
STACKS=12,256

4. Save and exit.

5. Type CD\Windows 

6. From  C:\Windows\ type Edit System.ini 
7. Add or modify the following entry in the [386Enh] section so that it is set to at least the following value:

MinSPs=4

NOTE: The MinSPs setting can be set higher if desired, but should be set in increments of 4. Each SP takes 4 KB of memory. (If there is no MinSPs statement, then the default value is set to 2.) For additional information on the MinSPs=4 setting, see the Microsoft Knowledge Base article There Are No Spare Stack Pages (ID Q149083).

8. (Windows 95 only). Add or modify the following entry in the [386Enh] section so that it is set to at least the following value:

MaxBPS=768

9. Save the changes, exit,  and then restart the computer for the changes to take effect.

This came from the Symantec web page.  I altered it to work with FSD1 computers.