fyi your gui win 64 wallet worked fine on win 8.
just wondering is solo mining only CPU with gui? Can you set it to utilize gpu's?
Probably not, to utilise gpu you need to get a gpu miner and set a solo mining

We do not plan to add GPU mining to the wallet as there's many other mining software that can do it better now. Please check
https://plurapool.com/#getting_started and download one of the reccommended mining software.