cant open any PDF files

for Acrobat, it work, but not for Photoshop:

Could you please try the following steps:

1- Close Reader

2- Hold down Windows key and press R on your keyboard, this will bring up Run dialogue box.

3- Type regedit in the run dialogue box and hit Enter, click Yes when User Account Control pop-up appears.

4- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options, delete the key AcroRd32.exe

5- Relaunch Reader