To copy your PuTTY sessions from one Windows computer or profile to another do the following.
To export saved sessions to a file run below in the Windows XP run box (Start -> Run and then type copy/paste entire line below into box and hit return)
regedit /e putty.reg “HKEY_CURRENT_USERSoftwareSimonTathamPuTTYSessions”
File will be saved in the home directory for your profile (e.g. c:Documents and Settingspowercram)
To import settings to Windows Vista copy file to a folder of your choice on Vista PC.
Right click putty.reg file and select merge. You will be warned by Vista regarding changes. Allow the changes and your setting will get merged/imported into Vista registry.