Windows 7: Video hardware error

I've been having problems with the ATI drivers for my HD Radeon 5470. I keep getting the "(AMD) Display driver has stopped working and has recovered", after the monitor getting random flecks of whatever color, then the screen going entirely (insert solid color here) before giving that message. Sometimes it even freezes my computer and I'm forced to reset computer. Please help.

Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 17/03/2012 22:51:21
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: David-PC
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2012-03-17T22:51:21.610416000Z" />
<EventRecordID>215778</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>David-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">0</Data>
<Data Name="BugcheckParameter1">0x0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0x0</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">true</Data>
<Data Name="PowerButtonTimestamp">129764982433513109</Data>
</EventData>
</Event>

Log Name: System
Source: RTL8167
Date: 21/03/2012 15:23:20
Event ID: 1
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: David-PC
Description:
Realtek PCIe GBE Family Controller is disconnected from network.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="RTL8167" />
<EventID Qualifiers="32768">1</EventID>
<Level>3</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-03-21T15:23:20.562782500Z" />
<EventRecordID>217721</EventRecordID>
<Channel>System</Channel>
<Computer>David-PC</Computer>
<Security />
</System>
<EventData>
<Data>\Device\NDMP5</Data>
<Data>Realtek PCIe GBE Family Controller</Data>
<Binary>00000000020030000000000001000080000000000000000000000000000000000000000000000000</Binary>
</EventData>
</Event>

SourceLog Name: System
Source: Display
Date: 21/03/2012 18:57:29
Event ID: 4101
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: David-PC
Description:
Display driver amdkmdap stopped responding and has successfully recovered.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Display" />
<EventID Qualifiers="0">4101</EventID>
<Level>3</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-03-21T18:57:29.000000000Z" />
<EventRecordID>218177</EventRecordID>
<Channel>System</Channel>
<Computer>David-PC</Computer>
<Security />
</System>
<EventData>
<Data>amdkmdap</Data>
<Data>
</Data>
</EventData>
</Event>

Windows
Summary
Video hardware error
Date
21/03/2012 18:57
Status
Not reported
Description
A problem with your video hardware caused Windows to stop working correctly.
Problem signature
Problem Event Name: LiveKernelEvent
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 6153
Files that help describe the problem
WD-20120321-1857.dmp
sysdata.xml
WERInternalMetadata.xml
Extra information about the problem
BCCode: 117
BCP1: FFFFFA8007335210
BCP2: FFFFF88004596C48
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1