Poser 8 and Poser Pro 2010 can safely be isntalled to the program Files folder, as they do not place their content there. Evene the old Poser 7 and Poser Pro can as long as you install your add-on content to an external folder (V4 and M4 are fine in external Runtimes in P7 and later; choose DAZ Studio as the target application to avoid the installer's check for Poser.exe).

However, the screen symptoms sound rather like a loose connection to me - fatigued cable or loose connector - which should be eminently fixable. At least ask the repair people why they don't think that is the issue.