Cannot double click and open .txt file - win 7 64 bit

Double clicking a file, Right clicking and choosing Send to and Open with always worked fine in XP 32 bit

Just got a new Win 7 64 bit computer

Installed PS Pad (4.5.6 - 2427) and told it to register .txt file during the install

I checked in the Control panel / Associate file types with programs and .txt is set to open with PS Pad.

Double clicking on a .txt file opens a new1.txt file, not the .txt file I am trying to open

Right clicking on a .txt file and choosing "Open with PS Pad" does the same thing, it opens a new1.txt file

Right clicking and choosing "Send To PS Pad" opens the .txt file correctly

Really would like to get the double click thing working if possible.
Thanks for any help

Download 4.5.7 from PSPad developer forum, replace PSPad.exe and reregister PSPad (program settings / system, Program settings / File association)

Thanks,
Seems to be working fine now with 4.5.7