Window 7 professional windows explorer crashes

i bought my laptop last year Dell studio xps 1645 with i7 processor. i got windows 7 professional with it. i started experiencing a problem that randomly my windows explorer started crashing, it happened quite often before but now happens just randomly. i dont understand any reason for it. Oh and when it crashes and restarts i can see the recovery partition of my hard drive in 'My Computer'. any suggestions on how to fix this?

In order for us to figure out exactly what happened, we need you to go to the event viewer and see what the exact issue it is when this happens. Right click on Computer->click Manage->Event Viewer->Windows Logs and Look through till you see Explorer.exe and a red exclamation mark. Then copy and paste the details into a reply. Thanks!

Okay so here are the details that i found:
Log Name: Application
Source: Application Error
Date: 12-Sep-11 5:57:19 PM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Hamza-PC
Description:
Faulting application name: Explorer.EXE, version: 6.1.7601.17567, time stamp: 0x4d672ee4
Faulting module name: ntdll.dll, version: 6.1.7601.17514, time stamp: 0x4ce7c8f9
Exception code: 0xc0000005
Fault offset: 0x00000000000532d0
Faulting process id: 0x9c0
Faulting application start time: 0x01cc713259a70a49
Faulting application path: C:\Windows\Explorer.EXE
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: bedc912f-dd3e-11e0-b549-b8ac6f53094e
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2011-09-12T12:57:19.000000000Z" />
<EventRecordID>52887</EventRecordID>
<Channel>Application</Channel>
<Computer>Hamza-PC</Computer>
<Security />
</System>
<EventData>
<Data>Explorer.EXE</Data>
<Data>6.1.7601.17567</Data>
<Data>4d672ee4</Data>
<Data>ntdll.dll</Data>
<Data>6.1.7601.17514</Data>
<Data>4ce7c8f9</Data>
<Data>c0000005</Data>
<Data>00000000000532d0</Data>
<Data>9c0</Data>
<Data>01cc713259a70a49</Data>
<Data>C:\Windows\Explorer.EXE</Data>
<Data>C:\Windows\SYSTEM32\ntdll.dll</Data>
<Data>bedc912f-dd3e-11e0-b549-b8ac6f53094e</Data>
</EventData>
</Event>

No Unfortunately i never did, however the explorer crashes have reduced quite alot now i don't know how or why.