Illegal System DLL Relocation

I have Windows Vista on a Dell Inspiron desktop computer and have been receiving this message: "logon.scr [also, splwow64.exe]: Illegal System DLL relocation. The system DLL kernel32.dll was relocated in memory. The application will not run properly. The relocation occurred because the DLL dynamically allocated memory occupied an address range reserved for Windows system DLLs. The vendor supplying the DLL should be contacted for a new DLL." I have spoken to 8 Dell reps, each of whom tried to fix the problem. Among the supposed resolutions of the problem were: the operating system was completely reinstalled; another Dell rep said malware caused the problem, and sold me an anti-malware program; a known Microsoft problem, starting with Windows XP and also Vista, involving auto updates; he did a system restore back to the date of the O/S reinstall; another rep said the Realtek driver caused the problem. The last rep made some kind of change to msconfig. I don't think any of them know the cause of the problem. It usually occurrs after I reboot the computer. I would greatly appreciate any information about this problem and how it can be fixed. [I also posted this at Microsoft's Support Group, but no response. I can't believe no one else has experienced this problem.] Thank you!

Paul