Based on the information you have provided, there are two possibilities, provided your graphics card has more than 64 megs of memory;

 

1. Your motherboard B+ circuit is showing a sign of age, in which case replacing the motherboard is the only solution.
2. The other possibility is the Power Supply itself. It is not uncommon for a power supply to lose viability on a machine that is consistently used for Rendering 3D graphics.

The graphics card should not be the issue, unless Vue is consistently crashing means bad drivers. Otherwise, a general slow down of system and applications usually indicates overheating, damaged CPU, Memory, or lack of an adequate supply of power. The CPU and the OpenGl software coupled with the memory and sometimes swapping out to disk are the main source of Rendering. The graphics card simply displays the results of the Render to screen, but does not usually do the Rendering itself.

 

Therefore I would swap out the power supply first. Find out what wattage your motherboard, CPU, and Graphics card require, i.e. 350 watts, and add an additional 10 to 25% more wattage and get the latest 20 or 24 pin power supply. Which ever pin configuration your motherboard requires? 

 

If the power supply is not the problem, then it is time to upgrade the board or better yet the system.  

Again, before you try all of the above, I would back up your Vue Materials Folders, and uninstall and reinstall Vue.  In addition Check the Administrators, Events Viewer to see if there are any Errors or warnings concerning sytem or application problems which may be related to the Operating System..

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