Video hardware error

Hello. I turned on my computer a few hours ago and it's been running much slower than normal. For example, it takes a minute for Windows to load when it usually only takes a few seconds. Please help. I think a video hardware error may be the cause. I recently updated from Internet Explorer 8 to 10.

Source
Windows
Summary
Video hardware error
Date
08/04/2013 21:25
Status
Solution available
Description
A problem with your video hardware caused Windows to stop working correctly.
Problem signature
Problem Event Name: LiveKernelEvent
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 6153
Extra information about the problem
BCCode: 117
BCP1: FFFFFA800556C230
BCP2: FFFFF88004706C48
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Bucket ID: X64_0x117_Tdr:2_IMAGE_atikmpag.sys
Server information: 53103f02-55dd-4a97-9ee6-9704e7ffb99e

Thanks, Pauly. I did a sfc scan and it found nothing wrong, so I suspected that the drivers may need to be updated. I'm not sure how to uninstall and update a driver, though.

The computer is running normally again. However, when I logged in today, it asked me to download the latest version of Adobe Flash Player. I wasn't connected to the Internet at the time. I clicked on 'Download' and it caused Adobe to stop working.


Source
Adobe® Flash® Player Installer/Uninstaller 11.6 r602
Summary
Stopped working
Date
19/04/2013 19:54
Status
Report sent
Description
Faulting Application Path: C:\Windows\System32\Macromed\Flash\FlashUtil64_11_6_602_180_ActiveX.exe
Problem signature
Problem Event Name: APPCRASH
Application Name: FlashUtil64_11_6_602_180_ActiveX.exe
Application Version: 11.6.602.180
Application Timestamp: 5130146c
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7601.17725
Fault Module Timestamp: 4ec4aa8e
Exception Code: c0000005
Exception Offset: 00000000000532d0
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 6153
Additional Information 1: 526c
Additional Information 2: 526ceb572d9e6bd519e11611660d9273
Additional Information 3: 3def
Additional Information 4: 3def1fb43b9743c20587d011c19d33e9
Extra information about the problem
Bucket ID: 99552579

I got another video hardware error a few hours ago. McAfee was doing a virus scan at the same time. The Action Centre said the AMD/ATI Video Driver stopped working properly.

Source
Windows
Summary
Video hardware error
Date
02/07/2013 20:17
Status
Solution available
Description
A problem with your video hardware caused Windows to stop working correctly.
Problem signature
Problem Event Name: LiveKernelEvent
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 6153
Extra information about the problem
BCCode: 117
BCP1: FFFFFA8006E1A290
BCP2: FFFFF88002F5DC48
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Bucket ID: X64_0x117_Tdr:2_IMAGE_atikmpag.sys
Server information: 97e3e35e-9769-4c0f-b902-2a21fd9ddc9c

Hi Pauly. I was trying to install a new AMD driver from the AMD website via the autodetect software and there was another Blue Screen of Death. I turned off my computer and turned it back on. It took a few minutes to load. I checked Device Manager and it said my ATI Radeon HD 5400 Series driver has a problem. It's not working at all. It seems Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged.