Also note: You can no longer install an unserialized copy of Illustrator. You can no longer copy unserialized versions from a server. You must now use the Installer for each serial number installed.
Update: Mark Arana reports that deleting the Preferences file for Illustrator's Adobe Registration program sometimes solved installation problems he was having.
Update: Stuart Larson had similar problems, which he solved by moving Illustrator 6 out of a sub-folder and to the root level of his drive, prior to running the Installer for version 7.
Update: Steve Lombardi claims, Adobe's advice notwithstanding, that he did get prompted for a serial number using a Custom Install.
b. Photoshop 4.0.1: conflict with SAM 4.5.1? Francisco Carrapico writes: "All the files that I try to open with Photoshop 4.0.1 when SAM Intercept is enabled indicate that they are infected and don't open. This did not happen with Photoshop 4.0. When I separately run the SAM application to check the files (using the May Definitions) it does not detect any problem."
Update: Symantec's John Harrison reports that they were unable to duplicate this problem, at least not with the June Definitions (due out in a few days).