Windows has been designed for a wide variety of applications. Unfortunately that means that, out-of-the-box, it works correctly for office or entertainment applications, but for DAW applications, several settings and features have to be fine-tuned.
Windows 7 SP1 is mandatory to run Merging software.
...
2.WINDOWS CONFIGURATION
DEVICE DRIVERS
Merging recommends to install WHQL (Driver certified by Microsoft) or if not available, the latest drivers from the manufacturer website.
...
Data Execution Prevention tab
If you have access to this setting, set it to "Turn on DEP for essential Windows programs and services only".
If you can't access this setting, the default configuration is "Turn on DEP for essential Windows programs and services only", so it is probably correctly configured.
System Protection tab
Back in the main System windows, switch to System Protection tab:
Make sure protection is turned on for your system drive.
Select the system drive and click on Configure.
Select Turn on system protection, and set a value for Disk Space Usage (usually 10% max).
Disable the system protection on the Media drive(s), as this feature only works on system files and programs.
...