My computer (Pentium 3, runs Windows 98) has recently developed a
problem but I don't know why. I would like this problem solved:
Whenever I click on anything regarding settings, e.g. desktop, mouse,
date/time, i.e anything in Control Panel, the following error message
comes up: "Access to the specified device, path or file is denied."
All I can do is click OK and it returns me to the Control Panel.
Basically, I can't do anything from Control Panel any more. Help!
I am re-posting this question for you Mr Hummer, as requested. Thanks!

Dear DB,

Thank you, I appreciate this. 

Your RUNDLL32.EXE may be corrupted. Running your System File Checker
may fix it, or you can do it manually.

Run your SFC:
START / RUN / TYPE sfc / CLICK OK / SCAN FOR ALTERED FILES / START

Manually:
Download RUNDLL32.EXE (Win98 & Win98 SE)
http://home.bendcable.com/CooperSoft/Patch/RUNDLL32.EXE
- Right-click on the downloaded file and select COPY.
- START / RUN / type C:\WINDOWS / ENTER
- Right-click in the Windows folder that opened, select PASTE.
If prompted to overwrite the file, answer 'Y'(YES).

I'm very happy to hear that it worked for you.
Sincerely,
Hums

Thank you, denverbloke. Take care, hummer