Ispell not working in TeX mode

[Rasmus Pank Roulund <rasmus.pank@gmail.com>]

Hey Emacs group,
I am having a problem with AUCTeX and Emacs. I have already described it 
in the AUCTeX group, but it seems that nobody there knew the answer.
   I use Emacsw32 22.0.990 and AUCTeX 11.85. Aspell 0.60.3.
   I use Aspell for spell-checking (obviously). I have split my hdd into 
two partitions. One for programs and one for data, documents etc. My tex 
documents are located on the data partition (letter D) while Emacs, 
AUCTeX and Aspell is located on the software partition (letter C).
   When I open a tex file on the D drive, AUCTeX is not able to start 
the ispell process. In messages is says:

     Starting new Ispell process [dansk] ...
     Applying style hooks... done
     Loading texmathp...done
     Error in post-command-hook: (error Process ispell not running)

Sometimes it writes
     Starting new Ispell process [dansk] ...
     Spell checking loese-tanker.tex using aspell with danse dictionary...
     Spell-checking using aspell with dansk dictionary done
     File mode specification error: (file-error "writing to process" 
"invalid argument" #<process ispell>)

If I switch the same file into text mode (rather than tex mode), ispell 
start. If I move the file to the C drive, ispell starts as well. If I 
start ispell from another buffer, and go back, to the tex buffer, there 
is no problem. However, if start ispell with English dictionary in one 
buffer, and switch to my tex buffer (using Danish dictionary), AUCTeX 
will freeze Emacs and I have to close down emacs.

Everything is within the PATH.
LaTeX-mode-hook consist of turn-on-auto-fill, preview-mode-setup, reftex 
-mode and flyspell mode. I have tried loading ispell as well, but it 
makes no difference.

I hope somebody will me able to help me solve this problem.
Thanks in advance,
Rasmus