Grisoft is planning to end the support of AVG Antivirus by August 2008, for the following Operating Systems:
Windows 98
Windows ME
Windows NT

All Users

Does the AVG AntiSpyware work under Windows 95, 98 and Me?
Unfortunately the Ewido security suite only works with Windows 2000, XP and Vista as it was developed to use many of the features introduced with Windows 2000. Also we currently can't and most likely won't provide a version for older Windows versions in future.

Is AVG Anti-Spyware compatible with 64-Bit versions of Windows?
Yes, from the build 7.5.1.36 it is compatible with Windows XP and Vista 64-Bit version.


End of Support: AVG AV on Windows 98/ME/NT U1-1200338054

Important notice
* Operating systems marked with an asterisk (MS Windows 98, MS Windows ME, MS Windows NT and MS Windows NT Server 4.0) will only be supported until August 2008.

End of Support: AVG AV on Windows 98/ME/NT U1-1200371892

End of Support: AVG AV on Windows 98/ME/NT U1-1200371912

NOTE: This applies to all edition of AVG. Free or Paid.