Windows 7 - The file structure on the disk is corrupt

I've been getting the following in the event viewer the last 3 days. The file structure on the disk is corrupt and unusable. Please run chkdsk utility on the volume HP. I've ran check disk twice and I still get it. I also downloaded WD Lifeguard Diagnostics and ran the Smart Test and the Extended test and both passed with no problems.The The computer seems to be running OK. I also checked the file system and it's OK. I get Ntfs Event 55 Task category (2). This is what it shows.

Log Name: System
Source: Ntfs
Date: 2/11/2011 8:01:04 AM
Event ID: 55
Task Category: (2)
Level: Error
Keywords: Classic
User: N/A
Computer: Richard
Description:
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume HP.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Ntfs" />
<EventID Qualifiers="49156">55</EventID>
<Level>2</Level>
<Task>2</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2011-02-11T14:01:04.172372500Z" />
<EventRecordID>7654</EventRecordID>
<Channel>System</Channel>
<Computer>Richard</Computer>
<Security />
</System>
<EventData>
<Data>
</Data>
<Data>HP</Data>
<Binary>00000C000200380002000000370004C000000000020100C000000000000000000000000000000000EE0C1400AB45 000000000D00</Binary>
</EventData>
</Event>

Did you run chkdsk /r ?

No, I've done everything but that so I guess I'll do that, it won't hurt to do it. Wouldn't the WD Lifeguard Diagnostics have found any bad sectors if there were any? It ran OK.

The HD maker's diagnostics/repair CD scan finds and repairs surface errors, separate from the file system.

So you need to run Disk Check in tandem with it: Disk Check

Tips for cleaning up factory bloatware, of which HP is worst: HP laptop has used up all four primary partitions

Many tech enthusiasts find a Windows 7 installation DVD to clean reinstall with the Product Key on the COA sticker, to get rid of the sponsored bloatware and useless factory utiltiies which have better versions built into Windows 7. This lets the best OS ever run completely free and unhindered: re-install windows 7

This is a clean install of windows 7, I reformatted on the 7th of this month and this started on the 8th. I've ran check disk twice with both boxes checked and it came back OK. The computer is running good.

I had used windows defragmentor to defag with. I installed my Perfect Disk 11 and did a boot defrag and then I defagmented the drive using Perfect Disk and then did a Smart Placement and since then the problem has been gone. This is the 2nd day without it showing up plus some other things disappeared also. Don't know why but as long as it's gone I'm happy.

Sounds better. I'd run HD Diagnostics and Disk Check periodically and keep files backed up and a backup image current.
Backup Complete Computer - Create an Image Backup
Backup User and System Files

I always keep a couple of images on an external hard drive.