This indicates a possible attempt to exploit a Heap Overflow vulnerability in Microsoft Windows Media Player 7.1.
The vulnerability can be exploited by crafting a malicious Bitmap file with the "size" field set to zero, but still containing some additional information. A successful exploit can lead to the execution of arbitrary code.
Microsoft Windows Media Player 7.1 on Windows 2000 SP4
Media Player 9 on Windows 200 SP4 and XP SP1
Media Player 10 on XP SP1 and SP2
System Compromise: Remote code execution.
Microsoft has released a security update for this vulnerability, please apply MS06-005.