Windows Stability Guard is a deceptive security software which gains to trick users into believing their PC is severely compromised and needs being cleaned with its “full” version. This is a fraud.
Malware spreads via trojan which enters the system through its vulnerabilities. Once active it starts to imitate computer scans and displays numerous fake warning messages that state about PC infections. For example:
Infected file: C:\Windows\System32\dllcache\wmpshell.dll
Do not fall for this scam because malware is not able to provide any actual computer protection service. Windows Stability Guard is designed to pilfer money from unwary users, so you need to ignore all offers and notifications it displays but use decent anti-spyware application and remove Windows Stability Guard upon detection.