I think user Jacee had similar issue with her wallet not opening. I think it had to do with the operating system she was using being Win32bit. You will need to go to her captcha solving thread here in this topic to see as it was fixed.
Just update the necessary updates on your pc, if all important updates are up to date then you should have no problem installing it. Btw my problem is not that I can't install the wallet, The wallet won't open when I am opening it. In my case I just click open then fo refresh the desktop for a couple of time then it will pop up. The wallet is not opening when I am not refreshing, I don't know the reason behind this yet.