A Lot of Rundll !!!!

Do I understand correctly that when you are on-line that you get error messages relative to Rundll????  And you get out of memory error messages?  More than one occurrence of RUNDLL.EXE or RUNDLL32.EXE?  It would prove helpful if you can tell us exactly what the error message is, and what you're running exactly at the time (via as you did, ALT-CTRL-DEL and advise what all is running, besides Explorer and Systray.

Do you run maintenance, ie. Scandisk/Defrag and clear your internet temporary files and history folders now and then?

What is your RAM, available memory, etc?  The more you tell us about your situation and your exact error message, the easier it will be for us to provide good solutions.

OK, let me try it... When I press crt+alt +del, i see in windows 98 box a lot of apps running. And I see rundll32 tree, four or five times appearing. What is it? If I close it, i don't see anything changing on my desktop! Can You help me?

Ok, Windows 98, that helps.  RUNDLL is called by 16 bit programs/or DLLs, and RUNDLL32 for 32 bit interfaces.  Perhaps one of these files,or a dependent system file is missing or damaged.  Try this:

Start
Run
SFC

Then Scan your system for altered or corrupted system files, replacing any shown as damaged,corrupted.  This facility will allow you to replace any damaged system files directly from your Windows 98 CD.

It would help to know all that is running when problems occur, not just the RUNDLL32.  

ARE YOU GETTING LOCKED UP OR ANY OTHER ERROR MESSAGES?

How are you doing?  Have any recommendations helped?