When I change my lighting in game, then try to build/update the lighting it crashes out my mod tools. Any ideas why. I have 8 gigs of ram or is it my processor not compatible with the tools?

Ensure you processor is SSE 4.1 compatible. You are unable to build lights if it doesn't support it.

so ill have to buy a new processor if it isn't compatible....rip  . I have a AMD Phenom(tm) ll X4 940 Processor
 i looked it up and here is what i found

Phenom X4

» K10 microarchitecture
» 0.065 micron
» Desktop CPU
» Quad core
» Up to 2.6 GHz
» 512 KB L2 cache per core
» 2 MB L3 cache
» 64-bit
» SSE2, SSE3, SSE4a
» Virtualization
» DDR2 support
Socket AM2
Socket AM2+