Invasion of the Data Snatchers Think your PC is safe? Think again. A new study indicates your home computer is likely bogged down with spyware, viruses and other scourges wrought by hackers and PC pranksters. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;