Incomplete Spyware removals

My copy of Spyware removal detected but did not completely remove two hidden embedded software
programs within Outlook Express and Internet Explorer. Now, it takes forever to load and execute Web searches and e-mail functions. How can I find and remove the errant DLL? This is on
my home PC, Intell 550 MHZ; 20 G hard drive with
Windows 98 first edition with Internet Explorer
6 and Outlook Explorer Version 6.

Thanks,

Paul Roden