Wipe Your Old Data
Once your files are on the new PC, erase them on the old system if you
don't plan to keep it. A hacker or identity thief won't be deterred by
your simply deleting the files, or even reformatting or repartitioning
the hard drive. If you want to leave Windows and your installed
software intact, use Webroot's $30 Window Washer utility, which
eradicates personal data, history files, log files, and so on, but
leaves your operating system and apps in place. You can download the
30-day trial version from PCWorld.com:
http://www.pcworld.com/downloads/file/fid,25803-order,1-page,1/description.html?tk=nl_urxdwn
To erase the hard drive completely (the OS, applications, and all),
overwrite it repeatedly with a disk-wipe utility such as the free
Active@ Kill Disk Hard Drive Eraser, which you can download from
PCWorld.com:
http://www.pcworld.com/downloads/file/fid,22920;order,1;page,1;c,All Down