This game is very dependant on it's system requirements meaning, playing it on WinXP is your best bet, as I've mentioned in the Rise of Clans forums as well. I ran into the same problems on my Win7 machine and recently tried my luck and got HTA: Rise of Clans, I ran into the same problems on Win7. After installing it on WinXP, I got no problems at all at about 10 hours into the game. Win7 is even more of a police-state dictatorship with all it's security and DRM measures and this causes file access problems with this particular game. Targem will need some support from Microsoft if they want to be able to patch this issue it seems, and the game is just not popular enough in the west

If you have a pre-installed Windows PC, then you have a problem, if you have both WinXP and Win7 on CD/DVD, you can install them both with dual-boot if you want to continue using Win7. If you install WinXP first and then Win7 on a seperate HDD/partition, you can dual-boot between the two, just Yandex/Google it for more info.
Fact is, the best solution for the "Unhandled Exception" error is to play it on WinXP.