(1) Click-Start on the taskbar, and then-Accessories-Click to run this system program.
② Next, enter %appdata%\Tencent\QQ\Misc in the started program.
(3) Click OK or Browse, and the system will automatically jump to a folder. At this time, you will find many files named after a string of numbers.
(4) These files with numbers as their names are all QQ numbers that you have logged in on the computer.
⑤ If you want to know the time when you logged in, click File View-this property contains the time when the file was generated. (This is the time for QQ login)