I decided to remove the Notifyalert.exe program from a Dell PC which appeared to be slowing it down. The program is part of the Dell Support program that you can normally remove under Add / Remove Programs. Apparently this only works for version 3. If you have version 2 of Dell Support then the Add / Remove programs function can fail.
If you have version 2 of the Dell Support program, you need to reinstall the program and then remove it. Go to http://support.dell.com/ and do a search on “uninstall dell support” which will give you a link to the uninstall program.