Windows Malware Debugging

I need urgent help with my Windows computer. It appears to have been infected by malware. I suspect it might be a serious issue as there have been unauthorized access and changes. The symptoms have become increasingly concerning.

Key Requirements:
- Comprehensive malware detection and removal
- System security analysis to prevent future breaches
- Restore system to original state

Skills and Experience:
- Strong background in Windows OS
- Proven experience in malware debugging
- Familiarity with various antivirus software
- Excellent problem-solving skills