Per your power director 10 user manual it mentions the following:
Extra Information: If your computer is running on a 32 bit operating
system, you can only see three resolution options (Low Preview
Resolution, Normal Preview Resolution, and High Preview
Resolution) in the pop-up menu. However, if your system is running on a
64 bit operating system, you will see two additional resolution options: HD
Preview Resolution and FULL HD Preview Resolution.
Media Viewer
I am running a 64 bit why am I not able to use the other use the hd preview resolution and full hd preview resolution which is grayed out with version le 10.0.0.2810