Hello kwret, and welcome to the forum
Unfortunately, drivers for Vista are still a problem with a lot of hardware, running a 64bit processor makes things even trickier.
You may find this thread interesting,
_http://www.dvbviewer.info/forum/lofiversion/index.php/t31063.html
I see you have 4Gb of RAM on your PC. Reducing the available RAM might help. (Note, its Vista SP1)
Another more cumbersome workaround could be to use a Virtual Machine running Win XP or something else. At the minute, I use VirtualBox for my VM's _http://www.virtualbox.org/
A combination of 'VMX Builder' and 'VMware Player' also works well. (All 3 are Free to use)
Good Luck