Game freezes after few minutes

[krako]

Ladies and gentlemen,

unfortunately, my copy of King's Bounty is absolutely unplayable due to an freezing error which occurs after 1-2 min of gameplay. The music continues to play, but everything else is completey frozen, making a hard-reset of the computer necessary.
Even in the two minutes before freezing, sometimes graphical glitches are visible, like flickering and ghosting.

Configuration:
- Kings Bounty, German Version, patched to 1.7
- Windows Vista 64
- 8 GB Ram, Nvidia 9600 GT (2560x1600), onboard Realtek sound.

What I tried, to no avail:
- Windows' Compatibility Modes
- Updating every driver in the system, incl. Direct X
- Multi / Single display
- Messing with ini file
- Running kb.exe as admin

Please deliver an solution to this asap.


An extremely frustrated and embarrassed costumer.