When I click Edit/Spell check or press CTRL+K, a msgbox like this appears

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Spell Checker
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This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.

I thought it could be that aspell6.dll needs to be registered, so opened a cmd window in
C:\Program Files\IDM Computer Solutions\UltraEdit-32\GNU\aspell\bin
and typed regsvr32 aspell6.dll - as a result this msgbox appeared

---------------------------
RegSvr32
---------------------------
LoadLibrary("aspell6.dll") failed - This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.

In Configuration / Spell checker / Dictionary - both 'Dictionary' and 'Added words' boxes are completely empty.

The [SpellChecker] section of my .ini looks like this I see there's nothing next to Dictionary= , tried to manually edit that line(in Notepad, with UE closed) like Dictionary=en , Dictionary=en-US , Dictionary=en-common (as en-common.rws is the largest file in C:\Program Files\IDM Computer Solutions\UltraEdit-32\GNU\aspell\dict\ folder) , but nothing happens - when UE starts, it deletes what I added and makes the line again just Dictionary= . It seems UE can't find any dictionary file

Any suggestion how to fix this ?

Thanks

Thanks for the reply Mofi.
I have the required folders & files, namely
C:\Program Files\IDM Computer Solutions\UltraEdit-32\GNU\aspell\ and inside it:
\bin -> aspell6.dll inside
\data -> various .cmap , .cset , .dat files inside
\dict -> various .rws , .multi , .alias files inside

Still, no dictionaries appear in the configuration dialog, no matter how I set the paths in 'Dictionary Directories'
Where UE looks to see what dictionaries are available? I guess it should look in
<path set as Aspell parent directory>\GNU\Aspell\dict\
, but obviously that's not the case as I have files there.

For testing I copied C:\Programs\UltraEd (my UltraEdit program directory with all the configuration files) to C:\Program Files\IDM Computer Solutions\UltraEdit-32 and renamend C:\Programs\UltraEd\GNU to something different to make sure that UltraEdit can't use the files in that directory.

Next I started uedit32.exe from the new location, opened the Dictionary Directories Spell Checker configuration dialog and changed the Aspell parent directory to C:\Program Files\IDM Computer Solutions\UltraEdit-32 like you. After closing the configuration dialog with OK, exiting UltraEdit and restarting it, I can see all the dictionaries in the configuration dialog and a quickly executed spell check also worked. I'm using UltraEdit v16.00.0.1036 English with the English dictionaries installed with UltraEdit.

I suggest to change the Personal data directory directory. Maybe C:\Documents and Settings\Administrator\Application Data\IDMComp\UltraEdit\ is the problem because with your current account this directory is write protected. You can easily check this with a try to save a new file in that directory. However, configure a different personal data directory like C:\Temp just to be sure that the personal data directory is not the problem.

If that does not help, you can use Filemon from SysInternals to find out why UltraEdit can't find any dictionary file although it looks like everything is set correct.

Attention: Just detected that v16.00.0.1038 was released by IDM and the UltraEdit hofix page contains at bottom of the list for v16.00.0.1036 the entry "Update for aspell". So first update your UE v16.00 installation and then try spell check again.

there's something really strange here.
C:\Documents and Settings\Administrator\Application Data\IDMComp\UltraEdit\ is writeable (just to be sure I set 'Full control' for 'Everyone' both for that folder and for UE installation folder)
I tried deleting the spell check section of the .ini, deleting the entire .ini etc., nothing
Updated to the latest .1038 version - nothing

And what's really strange is that I performed a default installation of .1038 in a virtual machine, a fresh copy of XP SP3 pro (a default Windows US-English installation without whatever tweaks or post-install customizations) where no IDM product was ever installed. UE shows exactly the same error messages as on my 'real' system (in my first post), and there are no dictionaries displayed in Spell checker -> Dictionary.
Trying to add a word to a dictionary makes UE to crash after clicking the 'Add' button, both in VM and real system.

Tried with Sysinternals' Process Explorer too. There are two failures related to the following non-existing files
C:\Program Files\IDM Computer Solutions\UltraEdit-32\GNU\Aspell\bin\aspell6.dll.2.Manifest
C:\Program Files\IDM Computer Solutions\UltraEdit-32\GNU\Aspell\bin\aspell6.dll.2.Config

Not sure what the problem could be, but seems to be a bug either in UE or aspell.

yes, I tried with C:\tmp (both with default permissions and full control set for everyone), no difference.
AFAIK in XP the built-in administrator account is no different than any other with admin rights. Anyway, in the VM I do not use the built-in administrator account but another account with admin rights, and the result is the same. I also tried with a limited user account , copied install dir to user desktop, set full control for everyone, changed paths etc., no difference.

well I solved it.
Just replaced \GNU\aspell\bin\aspell6.dll with an older copy of that file from a v15.00 backup - and all started to work normally. I didn't replace other files in \GNU\aspell\ with the older ones, just aspell6.dll
v15 aspell6.dll is 752 KB while v16 is only 416 KB (probably packed with something, and this might be the problem).
v15 does not have version info, v16 is 0.60.6.1

Hm, much smaller (without packing) Aspell 0.60.6 installed with UE v16.00 works fine on my installation. I'm not using spell check while typing. I just run a spell check as last step of writing a public text file. Installed with v15.20 of UltraEdit was Aspell 0.60.4.

Now with comparing the Aspell versions I could see that Aspell 0.60.6 was compiled by IDM with Visual Studio 2008 because it has a DLL dependency for msvcr90.dll and msvcp90.dll. On Windows 2000 and Windows XP those 2 DLLs are by default not installed. They are present when .NET frameworks are installed (not on my Windows XP) or any other application using MFC 9.0 (on my computer this was Personal Antivir from Avira). On Windows Vista and Windows 7 the redistributable DLLs of Visual Studio 2008 are always preinstalled.

Installing
Microsoft Visual C++ 2008 SP1 Redistributable Package (x86)
or older
Microsoft Visual C++ 2008 Redistributable Package (x86)
should fix problems caused by missing MFC 9.0 DLLs on Windows 2000 and Windows XP 32-bit.

Both packages exist also for 64-bit Windows, for example Microsoft Visual C++ 2008 SP1 Redistributable Package (x64).

I will report IDM that missing DLLs of Visual Studio 2008 could be a problem for using Aspell. And I will suggest that IDM should compile the DLL with Visual Studio 6, or add to help a link to the download page of Microsoft for the package.