There are three ways that this can be loaded at startup - as a service, from the registry or from the Startup folder.
If it's a service, open Computer Management > Services and Applications > Services, then find the Dell service and set it to disabled and stop the service.
If it is loaded by the registry:
Start > Run then type regedit. Then navigate to the HKLM\Software\Microsoft\Windows\current Version\Run, then delete the key with sprtcmd.exe.
Of course, the file might simply be loaded from the Startup Folder in either All Users or your account, in which case just got to C : \Documents and Settings\All Users (or your user)\Start Menu\Programs\Startup and remove the shortcut.
You can also use msconfig (Start > Run then type msconfig) to do these, but this often results in a raft of prompts telling you that such and such is disabled and do you want to re-enable it.
SD