As we all know, Windows stores most of the passwords which are used on a daily basis, including instant messenger passwords such as MSN, Yahoo, AOL, Windows messenger etc. Along with these, Windows also stores passwords of Outlook Express, SMTP, POP, FTP accounts and auto-complete passwords of many browsers like IE ,chrome and Firefox. There exists many tools for recovering these passwords from their stored places. Using these tools and anUSB pendrive you can create your own rootkit to sniff /hack passwords from any computer.