A warning that says “Warning! td_ChangeValue Found!” is a fake message coming from a rogue program Windows PC Defender. The full message reads:

Warning!td_ChangeValue Found!
Threat detected: td_ChangeValue
Threat name: KillBit
File at risk of infection: SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\.

 Alias: -

 Damage Level: Low

Systems Affected: Windows

Screenshot Image:

td_changevalue

How to remove “Warning!td_ChangeValue Found!”
1. Please see Windows PC Defender Removal