Since you are writing from Germany, you can try the different keyboard layout available for German language; in my version of Win98 (italian) I notice that there are 3 different layouts for german language (marked IBM, Standard and Swiss): maybe one of them is suitable for your needs. I had a similar problem with the italian version of Windows and solved it simply changing from the 'Italian' to the 'Italian 142' layout.
The following in case you don't know how to change the keyboard layout: in Control panel select Keyboard, then Language tab, then click on the language you are using between those installed and push 'Properties' button: in the popup that appears you can select the desired keyboard layout.
Hope this helps a little.
Roberto