How to copy PuTTY sessions from old HD or crashed computer

You can use some registry reading tool.

MiTeC Windows Registry Recovery 1.6.1

Run MiTec Windows Registry Recovery

• Go to File -> Open.
• Locate registry file of your account. It is typically located in C:\Users\username\ntuser.dat (or C:\Documents and Settings\username\ntuser.dat in Windows XP and older). This file is usually hidden and system.
• Go to Explore > Raw Data.
• Locate key Software/SimonTatham/PuTTY/Sessions.
• Go to File > Export to REGEDIT4 format.
• On Export to REGEDIT4 dialog, select HKEY_CURRENT_USER and check both Only selected key and Cut off root key name.
• Save export to file of your choice.
• Validate the entries in the key - Check and delete the root entry - example -

  REGEDIT4

  [HKEY_CURRENT_USER\ROOT\SOFTWARE\SimonTatham]

  [HKEY_CURRENT_USER\ROOT\SOFTWARE\SimonTatham\PuTTY]

  [HKEY_CURRENT_USER\ROOT\SOFTWARE\SimonTatham\PuTTY\Jumplist]

  
  
• Import the registry export by opening it double-click on file .reg.