8.1 wont boot/repair loop out of nowhere!! HELP!!!!

[hillelslovak]

Ok, My pc hasn't had many problems in the 2 years I've had it. About 7 months ago, I looked into my ram and it's got 4.2 gb ram reserved by hardware. This perplexed me, but it was essentially explained to me that the system would free the reserved ram when needed, so I didn't need to worry. Fast forward to yesterday. I cleaned out my ram sticks, gpu to clean around them. I was really careful, and upon boot, my pc recognized 10gb in the bios and cpuz, but still gave me the 4.2 reserved nonsense. I said screw it. This morning, I boot and have 1.5 gb ram available, so I reboot and reseat the ram. Now I boot up and it wont take me to the login or anything, and keeps telling me system drivers are missing, and it either goes into a repairing loop or shuts off entirely. I don't have a win 8 install disc, the pc was refurbished and came with none, and I never made a recovery usb or dvd. I have no other pcs that have windows 8 or 8.1. What can I do?
Specs
Specs:
Model

Brand
HP

Series
ENVY

Model
h8-1534 (H2N64AAR#ABA)

Quick Info

Type
Student/Home office

Usage
Consumer

Processor
AMD FX-6200 3.8GHz

Processor Main Features
64 bit 6-Core Processor

Cache Per Processor
6MB L2 Cache

Memory
10GB DDR3 1600

Storage
1.5TB SATA 7200RPM

Optical Drive
SuperMulti DVD Burner drive

Graphics
AMD Radeon HD 7570

Ethernet
Gigabit Ethernet

Power Supply
460W

Operating System
Windows 8 64-Bit

Motherboard

Chipset
AMD 970

CPU

CPU Type
AMD FX-Series

CPU Speed
FX-6200 (3.80GHz)

L2 Cache Per CPU
6MB

L3 Cache Per CPU
8MB

CPU Main Features
64 bit 6-Core Processor

Graphics

GPU/VGA Type
AMD Radeon HD 7570 2GB

Memory

Memory Capacity
10GB DDR3

Memory Speed
DDR3 1600

Form Factor
DIMM 240-pin

Memory Slot (Total)
4

Maximum Memory Supported
32GB

Hard Drive

HDD
1.5TB

HDD Interface
SATA

HDD RPM
7200rpm

Optical Drive

Optical Drive Type
DVD Super Multi

Front Panel Ports

Front USB
2 x USB 3.0

Front Audio Ports
2

Card Reader
15-in-1 multimedia card reader

Back Panel Ports

PS/2
2

Video Ports
1 DVI, 1 HDMI, 1 Display Port

Rear USB
4 x USB 2.0

RJ45
1 port

Rear Audio Ports
6 ports

S/P DIF
1 port

Expansion

PCI Slots (Available/Total)
1 x PCI Express x16 (Gen 2.0)
3 x PCI Express x1 (Gen 2.0)
1 x PCI Express mini card (for half-length add-in cards) with USB connector

The only changes I have made were upgrading my gpu to a geforce gtx 660 3gb FTW edition, and a corsair 600 w power supply.

 

[basroil]

If it says the drivers are missing, then the drivers are missing. Post the actual error code and try putting the old graphics card in for now.