Tracking cookies are not dangerous, and if you continue to use older IE versions, they are gonna be ubiquitous.
The registry entries in and of themselves are not actually malware; ie; they aren't programs. What is probably happening is that the virus itself has been zapped, but not all of it's effects on the registry have been undone.
Look in your Webroot logs to see if these specific viruses have been removed.
Here's Microsoft's page on the HackTool malware:
Technical Information (Analysis)
HackTool:Win32/PWDump.A is a tool used to obtain password hashes from Windows NT and 2000 machines.
The tool is installed as a service, usually named pwservice.exe. It utilizes the files pwdump3.exe and lsaext.dll, and is designed to remotely obtain password hashes from the memory of the target machine.
http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=HackTool%3AWin32%2FPWDump.A#symptoms_link
So you can see if you have either of these files on your system and/or run Windows Task Manager to see if the service is running.
If you want to really ensure that your system is cleaned out, run ComboFix.
http://www.bleepingcomputer.com/combofix/how-to-use-combofix
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