LOL what? You have been all over this thread talking about what you have been doing with your card. Looking for BIOS mod to give you 200% powerlimit. You have flashed your 56 with 64 LC BIOS. I think you had the 64 AIR BIOS installed as well. Not too long you mentioned the speeds you were running your card at and said you wouldn't recommend them.
And now you say the Card is giving you lots of problems in games. Are you really surprised? You can do benchmarks and get great scores etc. But gaming is much more sensitive to overclocks. What might work with benchmarking can give nothing but grief when gaming.
And the first step in troubleshooting problems with games is revert everything to stock.
I always run stock for games as the small increase that can be had from overclocking is not worth it for any possible problems. Games have enough bugs that cause crashes without overclocking adding to them.