Hello
a) Have you made any recent changes on the computer?
Method 1: In order to fix this issue, I would suggest you to refer the article given below and follow the steps from the link and check if it helps.
Note: This is also applies for windows 7:
How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows Vista
http://support.microsoft.com/kb/928228
Method 2: Try to perform clean boot and check if any of the third party applications are causing the issue.
To find out which startup application is causing the issue. Please follow the steps below:
Clean Boot will help you start your computer by using a minimal set of drivers and startup programs so that you can determine whether a background program or any of the third party service is interfering with your program.
Steps to perform a Clean Boot:
1. Click Start on your Desktop
2. Type msconfig in the Start Search box and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3. On the General tab, click Selective Startup.
4. Under Selective Startup, click to clear the Load Startup Items check box.
5. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.
6. Click OK.
7. When you are prompted, click Restart.
If the computer boots fine after clean boot, then there are some non Microsoft applications causing the problem. To find out which application causing the problem refer from step 2 to step 6 in the article this is mentioned in the clean boot article.
http://support.microsoft.com/kb/331796
Once you find out the application which is causing the issue, i would suggest you to uninstall and reinstall the application.
To return your computer back to normal boot:
1. Click Start on your Desktop
2. Type msconfig in the Start Search box and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
3. Click the General tab.
4. Click Normal Startup - load all device drivers and services, and then click OK.
5. When you are prompted, click Restart to restart the computer.
For information on using “Clean Boot”, see the following Microsoft Article:
http://support.microsoft.com/kb/331796
Method 3: Try to perform disk cleanup to remove temporary files from the computer. To do so, please follow the steps below:
The following procedure cleans up files associated with your user account. You can also use Disk Cleanup to clean up all the files on your computer.
1. Open Disk Cleanup by clicking the Start button. In the search box, type Disk Cleanup, and then, in the list of results, click Disk Cleanup.
2. In the Drives list, click the hard disk drive that you want to clean up, and then click OK.
3. In the Disk Cleanup dialog box, on the Disk Cleanup tab, select the check boxes for the file types that you want to delete, and then click OK.
4. In the message that appears, click Delete files.
For more information, please refer the link mentioned below:
Delete files using Disk Cleanup - Windows Help
Please post your results back.
