Of the 5 minidump files I read 4 are 0x0000001A: MEMORY_MANAGEMENT
This memory management error is usually hardware related.
* Nothing specific was cited as the cause.
The other error is 0x24 and this one specifically cited the AVG driver AVGIDSFilter.sys as the cause of your issue. However, the ox1A errors at this time are of more interest.
1. Prior to doing SLi did you have any issues?
2. Are your fans working properly on your video cards?
3. Please give us you hardware specs including make of power supply and the amount of watts it supplies, make, type, and amount of RAM you have installed, and also besides AVG list any other security software if you are running any.