Hi,
I would suggest you to try the methods and check the issue status..
Method 1:
How to disable and re-enable hibernation on a computer that is running Windows.
http://support.microsoft.com/kb/920730
Method 2:
I would suggest you to try the methods mentioned in the following link.
How to troubleshoot performance issues with standby, hibernate, and resume in Windows(applicable to Windows 7 as well).
http://support.microsoft.com/kb/950686
Method 3:
Check a drive for errors.
http://windows.microsoft.com/en-US/windows7/Check-a-drive-for-errors
Note: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully.
For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft
Knowledge Base:
322756 (http://support.microsoft.com/kb/322756/
)
How to back up and restore the registry in Windows.