Help with Microsoft Visual C++ error

I am running Windows XP with updated service packs.  I just started getting a Runtime error that says:  Program: C\WINDOWS\system32\rundll32.exe then on the following line it says R6030 and on the final line it is saying -CRT not initialized.  I am not even sure what Visual C++ is and I don't know how ot fix this.  It is popping up intermittedly throughout the time I am on the computer.  When I am shutting my computer down there is also an error message about my security, but it flashes so fast that I cannot read the entier message before my computer shuts down.  Everything seems to be working fine, it is mostly just annoying and I would like to have it stop if possible.  I don't know a lot about computers- any help someone could give me would be greatly appreciated.