Perhaps this MS article will help:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;170086
Basically:
"Use Registry Editor to view the following two Windows registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
Verify that all the values in these keys do not contain any incorrect, incomplete, or null entries (such as ""). "
http://support.microsoft.com/default.aspx?scid=kb;EN-US;170086
Basically:
"Use Registry Editor to view the following two Windows registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
Verify that all the values in these keys do not contain any incorrect, incomplete, or null entries (such as ""). "