InfoWorld's tests of the final Windows 7 version (the RTM, or "release to manufacturing") confirms a massive memory leak that occurs when the chkdsk.exe utility is run. Chkdsk.exe scans the PC's hard drives looking for errors in the files and file structures. The memory leak -- which can cause the PC to stop operating -- occurs when chkdsk.exe is run on secondary disks, as opposed to the disk Windows is installed on.
The bug was first reported this morning at several Web sites. Microsoft is due to ship Windows 7 on Oct. 22, and it finalized the Windows RTM in mid-July.
Source and More Detail : InfoWorld