Computer is drastically slower, after a random system error.

Hello, I'm generally new to the forum, what happened to me has never happened to me before. All the time my computer has been running fine. No viruses, no lag and no choppy performance. But, today when I tried to start up my computer I got a "disk read error" with no past of computer problems. I decided to set all defaults in the BIOS and flashed the CMOS, when that was done and restarted my computer it started up fine. All my drivers are up to date... I'm not sure what's wrong. But, sure enough, I shut down my computer previously today to install updates today at 3:05 AM and left my computer alone to shut down and woke up with the error. Maybe that may have been the problem. The update was supposedly a security update. This choppiness has made my games unplayable, about 14-15 fps WITH a GTX 275 Superclocked. This has never happened before, I cleaned out my computer with CCleaner, registry and things like that. I'm absolutely clueless right now. Also, on my motherboard there is an orange light repeatedly blinking, which indicates that my HDD shouldn't be the problem. And it's not possible my CPU overheats, because my temp is constant 20-35 Degrees celcius with a stock cooler. In addition, for some reason my Memory is supposed to be 1600 MHZ while it's only running at 1067 MHZ, could that possibly be the problem? My computer specs are as followed:

CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop Memory Model TR3X6G1600C9 - Newegg
The ultimate Intel X58 Core i7 performance memory
EVGA E758-A1 3-Way SLI (x16/x16/x8) LGA 1366 Intel X58 ATX Intel Motherboard - Newegg, rated no.1 in i7 motherboards.
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.100218-0019)
Language: English (Regional Setting: English)
System Manufacturer: OEM
System Model: OEM
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz (8 CPUs), ~2.7GHz
Memory: 6134MB RAM
Page File: 2861MB used, 9610MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 64bit Unicode
Graphics Card:

Card name: NVIDIA GeForce GTX 275
Manufacturer: NVIDIA
Chip type: GeForce GTX 275
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_05E6&SUBSYS_11733842&REV_A1
Display Memory: 3688 MB
Dedicated Memory: 877 MB
Shared Memory: 2811 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor: Generic PnP Monitor
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver Version: 8.17.0011.9745 (English)
DDI Version: 10
BGRA Supported: Yes

All taken from DxDiag. Thanks for any possible help you can give me, I will appreciate it greatly. :p
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More about computer drastically slower random system error
  1. hello

    try to reinstall your windows
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