Ok so my computer one day stopped playing a lot of videos, most noticeably on youtube and facebook but on other video players as well. Well the video would play but it would be either a plain green screen or a flickering green screen and there is audio. I googled the issue and everything told me to download a codec pack. So I download a smaller one with only necessary ones but the problem continued so I download this one http://www.free-codecs.com/download..._Codec_Pack.htm, which is a super mega pack. Unfortunately that didn't fix it either. So does anyone know what's wrong/how I can fix this? If there was something I needed to do with the codecs after I downloaded them then that's probably the problem because I didn't know what to do. Any help is appriciated Also I don't know what file types don't play because I usually just stream videos so I don't know how to see that. If anyone needs to know that to help me fix this then just tell me how to find that out and I will

Is it just flash-based video content that cannot be played, via a browser? Then, what browser do you use, which version? Does it occur just in this browser or all web browsers?
Can movies on DVD / BluRay(if you have the drive and discs) be played on the machine? What player do you use primarily? If just Windows Media Player, than please also download and try on VLC. This player can most usually handle any type of codec.

Has anything on the system been changed, lately? Ran Windows updates or driver updates, etc? What DirectX version is installed?

Can you also post Game Help:System Specs^wiki, so we can see if the drivers need updating, if no updates have been applied recently?

If youtube videos and facebook videos are flash then yes it is flash based videos. I use google chrome version 18.0.1025.162 and it says it's up to date so i assume that that's the current version. I just tried the same videos that don't work in chrome and they play just fine in internet explorer so it's probably just a chrome issue (?) but I'll post everything else you asked anyways

I can play DVD's in both windows media player and media player classic with no issues.

I think I updated flash player so that could have caused it. I'm not aware of any changes to google chrome except a theme change but I don't know if that corresponds with the issue or not and I can't see how it would affect anything.

System Specs are:
------------------
System Information
------------------
Time of this report: 4/24/2012, 12:59:14
Machine name: EMILY-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120305-1505)
Language: English (Regional Setting: English)
System Manufacturer: BIOSTAR Group
System Model: H61MHB
BIOS: BIOS Date: 05/17/11 14:03:17 Ver: 04.06.04
Processor: Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz (4 CPUs), ~3.1GHz
Memory: 8192MB RAM
Available OS Memory: 8174MB RAM
Page File: 3405MB used, 12941MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
--------------
Display Devices
---------------
Card name: NVIDIA GeForce GT 520
Manufacturer: NVIDIA
Chip type: GeForce GT 520
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_1040&SUBSYS_15253842&REV_A1
Display Memory: 4065 MB
Dedicated Memory: 993 MB
Shared Memory: 3071 MB
Current Mode: 1280 x 1024 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: CMC 17" AD
Monitor Id: CMO7801
Native Mode: 1280 x 1024(p) (60.020Hz)
Output Type: HD15
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver File Version: 8.17.0012.8562 (English)
Driver Version: 8.17.12.8562
DDI Version: 11
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 10/15/2011 03:53:00, 15693120 bytes
-------------
Sound Devices
-------------
Description: Speakers (VIA High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_1106&DEV_E721&SUBSYS_1565810A&REV_1001
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: viahduaa.sys
Driver Version: 6.00.0001.9100 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 12/14/2010 18:34:00, 1357424 bytes
------------------------
Disk & DVD/CD-ROM Drives
------------------------
Drive: C:
Free Space: 814.4 GB
Total Space: 953.8 GB
File System: NTFS
Model: ST31000524AS ATA Device
Drive: D:
Model: ATAPI iHAS124 B ATA Device
Driver: c:\windows\system32\drivers\cdrom.sys, 6.01.7601.17514 (English), , 0 bytes

Thanks for the help

You may need more than Flash, or that install is corrupt. Uninstall anything Flash-related (or all Adobe related if you have the Air and Shockwave components) from Control Panel. Go to http://www.adobe.com/ and on the Download section (on the right), first redownload Flash and reinstall. If that works, you don't need Shockwave and Air.
If that didn't work, disable hardware acceleration, see https://groups.google.com/a/googlep...ome/ITOa6R-xOSg
If you still have issues after all that, then try Air first and then again if issue persists, get Shockwave.

And, here's the update for your graphics drivers: http://www.geforce.com/drivers/results/43997

Thank you so much as soon as I disabled hardware acceleration it started working just fine