Kenerel inpage error / insufficient privileges to run chkdsk /r

I'm running Windows 7 on a 3-year old HP machine but haven't been able to install Windows updates for several months now.

I ran the check recommended here http://windows.microsoft.com/en-gb/w...indows-updates and started to install updates.

Half way through the process I briefly saw the blue page explaining that I have a Kernel Inpage Damage Error.

So I tried to run chkdsk /r as recommended at http://forums.techguy.org/windows-7/...age-error.html

However, when I tried running this I got the following message:

Access Denied as you do not have sufficient privileges.
You have to invoke this utility running in an elevated mode.

Not really sure where to go from here. Any suggestions?

Thanks

Kaygoo