"RUNDLL" and more... ?

Can anyone tell me what this is and why all of the sudden does my computer at boot-up say that it's missing? We use Win98 on an Intel PII 434 MHz 224 mb PC100 SDRAM with a 15 gig HDD. We haven't really changed anything, other then deleted Photoshop 5.5 because we found that we were not using it, and it was taking up space on the drive for nothing. What is RUNDLL? and how do I get it back?

Second question: I have heard that the Win98 Splash Screen can somehow be removed perminently during boot-up to make the system boot faster. This computer used to be fast for us, but with the growing number of programs and games... well you know, things will tend to slow down. I'm trying to find any tips and tricks to speed up this old beast...?

If anyone could help on either of these questions?

 

Here are a few links that may help.

http://forums.techguy.org/t110854/s.html

My favorite is spybot. Great tool for removing malware.
Also other things to consider:
1) Antivirus up to date
2) Windows updates current
3)Startup items (msconfig) You can check what you have at the link below
http://www.lafn.org/webconnect/mentor/startup/PENINDEX.HTM
4)add\remove progams that you don't use anymore (deleting them should be a last resort as it dosen't remove files that are associated with programs)even with add\remove you often have to remove the empty folders

Rundll is run dynamic link library

as to getting it back I will let another tech handle that as I have to go