2 Answers

If you used a free scan on the web...ignore it. Those 200 "threats" are probably just tracking cookies that get ignored by your anti virus because they are not a virus threat . The "free" scans you find on the internet just tell you about these "threats" in hopes that you will buy their cheesy program that is virtually useless. 

You can remove the cookies on your own by doing this:

How to Delete Cookies http://www.ehow.com/how_18044_delete-cookies.html 

1. Stop Fake Microsoft Security Essential Alert process by pressing Ctrl+Alt+Del. Windows Task Manager will open. Look for the following process:
(random characters).exe
avsuite.exe
avsoft.exe

2. Update your installed anti-virus program.
3. Run a full system scan and clean/delete all detected infected file(s). A manual removal of virus-related files should also be performed.
4. Edit Windows registry and delete Fake Microsoft Security Essential Alert entries. [how to edit registry]
5. Exit registry editor.
6. Remove Fake Microsoft Security Essential Alert start-up entry by going to Start > Run, type msconfig on the “Open” dialog box. System Configuration Utility will open. Go to Startup tab and remove check mark on the following Startup item(s):
(random characters).exe
avsuite.exe
avsoft.exe

7. Click Apply and restart Windows.