Black screen with grimefighter

Avast Cleanup
1

Whenever I reboot and start grimefighter all my computer does is go completely blank, the screen goes darkish grey and I cant see anything going on. My cursor is nowhere to be seen, no loading bar, nothing except a blank screen full of nothingness. Please Help me, I bought GrimeFighter about 5 days ago and its done nothing but lead me to a blank screen that I end up having to shut down the computer and turn it back on again to get to my desktop. Ive had the program run for 18 hours, but I rebooted because nothing was happening and that is way too long for a program to run. I built my own computer, This might be useful to know. My computer specs:

CPU
Intel Core i5-3570K 3.4GHz Quad-Core Processor

CPU Cooler
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler

Motherboard
ASRock Z77 Extreme4 ATX LGA1155 Motherboard

Memory
Crucial 4GB (1 x 4GB) DDR3-1333 Memory

Storage
Sandisk Solid State Drive 128GB 2.5" Solid State Drive

Video Card
EVGA GeForce GTX 660 2GB Video Card

Case
Cooler Master HAF 912 ATX Mid Tower Case

Power Supply
Corsair Builder 500W 80+ Bronze Certified ATX Power Supply

Optical Drive
Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer

Operating System
Microsoft Windows 8.1 (OEM) (64-bit)

Anything I can do about it???

2

If GrimeFighter is not working on your system there is nothing you can do.
Just ask your money back.
https://forum.avast.com/index.php?topic=154831.msg1172746#msg1172746

3

Getting the money back is the smallest concern. Getting the computer up and running is what I am concerned about. Have rebooted 20 times and always end up with the black screen.

4

Try pressing F8 when you start your computer. A screen should come up so that you have an option to start Windows in safe mode.

5

Was not able to press F8 or Shift+F8, but I was able to get into the BIOS by pressing F2. There I found the Grimefighter as a boot option and I moved it last on the list and Windows on the top and it did boot OK.

6

Good.