This is from a support site so may or may not work:
"System Exception: Access Violation" error.
Clicking "OK" may or may not then freeze FrontPage, forcing the user to end the program manually.
1. One of the users was running Office XP, FrontPage 2002, and Windows XP. He contacted Microsoft Support and writes:
"They told me to uninstall Office XP including FrontPage, go to start > run > regedit, go to HKEY_CURRENT_USER / software/Microsoft/office and delete folder 10.0. Then, reinstall Office.
2. Another user was also running Office XP, FrontPage 2002, and Windows XP. When he tried fix #1 said that this fix worked, but after installing the service packs, it broke again. He had to uninstall (again) and delete the registry folder, then reinstalled Office, FrontPage, and the template successfully.
3. Another user had Office XP and FrontPage 2003 running on Windows Professional 2000, and after trying many solutions finally contacted Microsoft's paid support. This solution seemed to work for him:
"Delete FP2003, and reload FP2003 In its own separate file folder, not in any MS or office file." According to this user, "It worked like magic, problem solved in 5 minutes."
Sorry I can't be of more help, but I've not directly encountered this one before so a fix isn't readily to hand from experience (I prefer to quote what I know works than what I find using Google where possible).