Windows 7: Samsung Optical Drive FW update - strange problem

Only the other day I was trying to update the firmware of my Samsung Optical drive. I downloaded the exe file from the Samsung website. When run, one gets the main Window and a caution dialog box. The OK button at the bottom of the caution dialog box was totally inaccessible and cutoff. . So I could not click on it to proceed with the update. Neither "ENTER" nor "CTRL+Enter" would work. I had to invoke the Task Manager to close the program.

After scratching my head for sometime, I decided to download the exe file from some other website and try. I could just see the top edge of the "OK" dialog box - see the hand symbol in the screenshot - and managed to click on it to complete the flashing.

Screenshot below:



Now the question is

1. Why does this happen?

2. What is to be done to bring out that invisible OK tab?

(The resolution of my display is 1280 x 1024 (native))