Ok:
Mining software: guiminer
Graphics card: AMD Radeon HD 6500
Computer specs:
Windows 7 Home Premium 64-Bit
Intel Core i5 CPU 2.53 GHz
6 GB RAM
Is that enough? Like I said, I'm not very experienced.
Make sure you have your 6pin PCI-e power adapter plugged in. 40Mhash seems about right if you don't have the power connector plugged in.