Problems with DivX occur when a feature called Data Execution Prevention is enabled with XP Service Pack 2.
Some of our products may not work with Microsoft Windows XP Service Pack 2 when a feature called Data Execution Prevention (DEP) is enabled. DEP is enabled by default in Service Pack 2. Typical symptoms include the following:
DivX
The DivX codec may not appear in the list of available video compressors
DivX ProThe DivX Pro codec may not appear in the list of available video compressors
Dr DivX
The Dr DivX installer may exit before installation is completed
The DivX Pro codec may not appear in the list of available video compressors
Right-clicking files in Windows Explorer may cause Explorer to crash
Source: DivX.com Forums

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