Windows 7 Compatibility
There are no known major issues with any version of CSE HTML Validator and Windows 7.
Minor Issues for Older Versions
The name of the sound file used for validations that have errors or warnings has changed in Windows 7 so, if you want this sound to play, then this file has to be manually specified for versions before 7.9921. To specify the sound, goto Options->Validator Engine Options->General tab and specify a sound file for "Play when validation generates errors or warnings". For Windows 7, the default is "C:\Windows\Media\Windows Critical Stop.wav". This default is automatically set if using CSE HTML Validator v7.9921 or above.