(I am in England.) Yesterday (2 Jan 2015) my Poser 10 on my PC computer with WIndows 10 worked as usual.

Today, whenever I try to call Poser 10, the initial Poser 10 window with the smiling woman appears, but the stage display and its windows does not appear, and instead the Poser 4 run hangs as if it can't find a file, and then it halts with error display "Poser executable file has stopped working. A problem caused the program to stop working. Windows will close the program and notify you if a solution is available." Before, that happened only when I asked my Poser 10 to make a render that needed too much time or working-space resources. But now it always happens as my Poser 10 is starting, even if the ---.pz3 file's stage is empty,

I reinstalled Poser 10 twice, but the fault persisted. I then called Defraggler to defragment my PC; the run took many hours. The fault still always happens.

A curiosity :: each time that I reinstalled my Poser 10 from its disk today, it did NOT ask me for a serial number. (I have the serial number OK.)

I am using about a tenth of my computer's hard disk space.

Other programs which are not graphical, still work.

PLEASE HELP.

What is happening? I can't run my Poser 10 now.

If there is no cure except to buy Poser 11, how do I buy Poser 11?