Unable to load xxx on dos bootup

Use load High memory approach to load the driver on high memeory area. E.g. LH X.

Of course you have conventional memory but some drivers require more space or has to be uploaded in high memory.

Try LH and see if it works out for you if it won't check the DOS versions of the drivers.

edit your config.sys file, insure it contains these two lines.

device=emm386.exe
device=himem.sys

optional line dos=high,umb

You may also have to include the entire path for the files, "example device=c:\windows\command\emm386.exe"

Try This: (Remember that Dos only starts in 640k Ram. To use the remaining 360k, you need a memory manager - emm386.exe)

In Config.sys

Device=himem.sys /testmem:off
Device=emm386.exe
Dos=high,umb

Load all Drivers in Config.sys files with the line:
Devicehigh=?:\??? (Drive:\File)

Load all Autoexec.bat Files with the line:

LH(space)?:\??? (Drive:\File)

Reboot and test the drivers you just loaded using the F-8 key at bootup and step through the load sequence of these two files.
If you are using your CDROM drive, you may want to load smartdrv.exe to cache it.
IE:
LH mscdex.exe /D:????(your cdroms "Name" from the config.sys file)and possibly /L:? (drive letter to assign cdrom to)
LH smartdrv.exe /X ("X" disables write-behind caching for all drives)
Example:
LH mscdex.exe /D:mscd001 /L:E
LH smartdrv.exe /x

If you have a hard drive with more than 2 partitions on it, you will have to add a
"Lastdrive" statement to the config.sys file.
IE:
lastdrive=F orG or Z (the higher the drive letter you use, takes more conventional ram, so use the lowest value)
You may have to supply the entire path to the files. IE:
device=c:\windows\command\emm386.exe"