Knowing the source can help me give you more specific advice on how to clean your system.
Software that locks your files until you pay a fee. Red Flags to Watch For FOCUS_on_YOU.rar
You can upload the .rar file (or its hash) to VirusTotal to see if dozens of different security engines flag it as dangerous. Knowing the source can help me give you
Designed to grab your saved passwords and credit card info. Keyloggers: Programs that record every keystroke you type. FOCUS_on_YOU.rar
If you weren't expecting a collection of photos or documents, don't go looking for them inside a mystery archive. How to Stay Safe
Did it arrive via a random email or a "dm" from a stranger?