I have been trying to install several applications on my Nokia 5800 XM but had a tough time doing it as I was always getting ‘File corrupted’ error.
I started investigating everywhere and didn’t find a satisfactory answer from anyone. I rechecked my steps and found out that the problem was only when I was installing in Memory card. I tried installing the application in Phone Memory and everything seems to be fine.
If this didn’t work for you, try the trick suggested by many i.e., reformatting your phone after taking backup of all the crucial data.