Hi Rick,
        Ran into this problem with Norton Utilities 3, which was I think fixed
with one of the updates.  The following information is from Symantec's
site, and may help even if you're not running Norton on any of the
computers:

http://service1.symantec.com/SUPPORT/nunt.nsf/1bcea383ea58bc8185256553006930eb/a203a59d6eb68a1288256569007ddbdf?OpenDocument

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Norton Utilities 3.0 - Win95 Knowledge Base
Missing HIMEM.SYS or A20 Error when Rebooting Windows 95 Situation:
When you reboot the computer, it displays one of the following error
messages:
"Windows XMS driver: Unable to control A20 line; XMS driver not
installed."
"HIMEM.SYS is missing."
Solution:
Turn the computer off completely and wait 30 seconds before turning it
back on. While it is off, unplug the keyboard and plug it back in.
If this does not solve the problem, follow these steps to make changes
to the computer's startup files:
1. Reboot the computer.
2. When the screen says "Starting Windows 95" or "Starting Windows 98,"
immediately press F8. This displays the Windows 95 Startup Menu.
3. Select Safe Mode - Command Prompt Only and press Enter.
4. At the C:\> prompt, type: EDIT AUTOEXEC.BAT [Enter]
5. You should now have a blue screen which you can edit text in.  At the
very beginning of the file, add the following line: SET DOS16M=2
6. Press Alt+F to open the File menu. Choose Exit and press Enter. When
prompted to save changes, answer Yes and press Enter.
7. You will now be back at the C:\> prompt. Type: EDIT CONFIG.SYS
[Enter]
8. In the text editor, find a line which refers to a file called
HIMEM.SYS.
9. Add the following to the very end of that line: /M:1
10. If you do not have a HIMEM.SYS line, add the following line:
DEVICE=C:\Windows\HIMEM.SYS /M:1
You may need to alter the path to point to the Windows directory if it
is different than the line above.
NOTE: The /M:1 line depends upon the hardware version of the A20
handler. You may need to try the numbers 1-17 (for instance, /M:12) to
find the correct version for the computer. PS/2 computers and Prolinea
computers, for example, tend to require /M:2 instead of /M:1.
11. Press Alt+F to open the File menu. Choose Exit and press Enter. When
prompted to save changes, answer Yes and press Enter.
12. Reboot the computer. It should now boot normally.
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                                                Terry L. Clark
                                                [log in to unmask]
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Rick van Heyst wrote:
> I have a bunch of old 486 VESA system boards
> When we boot up DOS 6.22 and the Himem.sys driver is loaded in Config.sys
> we get the message: "ERROR: Unable to control A20 line   XMS driver not
> loaded".

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