Getting Event ID: 51 In Vista

Out of the blue i get this Event ID 51 in Vista.  it tells me to make sure that the dive is back-up. I have replaced the disk and still get the error. i did notice it happens when i down loading movies, I am not sure it that any to do with it.

The hardware is a IBM think pad T60 with 250 gigs of storage and a gig of ram

this is the event id
Log Name:      System
Source:        disk
Date:          1/29/2008 11:05:34 AM
Event ID:      51
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Evilclownsho-PC
An error was detected on device \Device\Harddisk1\DR2 during a paging operation.
Event Xml:
<Event xmlns="">
    <Provider Name="disk" />
    <EventID Qualifiers="32772">51</EventID>
    <TimeCreated SystemTime="2008-01-29T16:05:34.310Z" />
    <Security />
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Did you change the hard disk data cable at the same time as changing the disk itself?
If not - try that.
Otherwise - this is most likely a motherboard/controller issue...

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