It seems that your operating system has some redirection to drive H: and when you try to install Prism it tries to open the MSI content into a temporary folder in drive H: which of course does not exist.

Try to set temporary drive H:\ with the following steps:

a. Create a new text file
b. Add it with the following text:

subst H: /D
subst H: C:\

c. Save the file.

d. Rename the file to start.bat (Note: Extension must be "bat" )

e. Double click on the file.

This should create a virtual drive H:\ pointing to C:\
It will be removed on restart.

Now try to install the software.