Ok so I'm running AutoCAD 2012 (Vanilla) on:

Machine Configuration
---------------------
Dell Optiplex 980
Intel Core i7 CPU
Processor Speed : 2.8 GHz
RAM 4G

32 Bit System

Windows 7 Opsys

Video Card:

Name : ATI Radeon HD 3400 Series
Manufacturer : ATI
Chip set : Radeon HD 3400 Series
Memory : 1749 MB
Driver : 8.17.0010.1070
Usually 2 to 3 times a week the driver crashes stating:

"The configured Heidi Driver cannot be loaded.".

Any ideas?