Failed OC, removed CMOS battery, stuck at windows screen

Hi all! I tried to overclock my i5 2500k from it's stock speed of 3.3GHz to 4.5GHz but I failed (not surprising, I am extremely new at overclocking) and so I removed the CMOS battery on my motherboard to reset the BIOS settings and I am now running into a problem. I removed my CMOS battery once a few weeks ago and I ended up having to take my computer into Memory Express because I could not get past the Windows 7 loading screen. They figured out it was a really minor problem, and the woman who returned my computer mumbled something about the HDD being set to AHSCI instead of IDE or something like that. Anyways, the problem I am having now is identical to the one I had a few weeks ago, so how would I go about fixing it? I looked through the BIOS thoroughly for IDE and AHSCI but I didn't see either of those anywhere.

My specs are:
i5 2500k
MSI z68a GD55
Windows 7 64 bit
Seagate Barracuda 500GB
XFX Radeon 7970
8GB HyperX elite RAM
Corsair CX 750 PSU

Thank you for any and all feedback!
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More about failed removed cmos battery stuck windows screen
  1. U r extremely new to OC and u tired Extreme speed......from 3.3GHz to 4.5GHz right away .....

    enter the BIOS and set to "Default values"

    without a liquid CPU cooler....u shouldn't try to OC ur Processor
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