I THINK I HAVE A VIRUS - DIAGNOSTIC & REMOVAL GUIDE

Your Computer Is Acting Strange. Here's What's Actually Happening.

Not every weird behavior means you have a virus. Let's figure out what's going on—and what to do about it.

Check These Signs First:

  • Computer is noticeably slower than normal
  • Pop-ups appearing when you're not browsing
  • New toolbars or extensions appeared without you installing them
  • Browser homepage changed without your permission
  • Unfamiliar programs in your Applications/Programs list
  • Your antivirus software is disabled or won't turn on
  • Strange sounds or disk activity even when you're not using anything
  • Files or programs disappeared
  • You're getting warnings about "system threats" or "security issues"

What This Probably Means:

  • All or most of the above? You likely have malware. This guide will help.
  • Just slow performance? Could be malware, but also could be a full hard drive, outdated software, or too many programs running. We'll cover diagnosis.
  • Just pop-ups? Probably browser hijacking or an unwanted extension. Easiest to fix.
  • Warnings about threats? Could be fake security alerts (scareware). Don't click on them.

Section 2: Immediate Actions (Do These First)

Step 1: Disconnect from the Internet

  • If you suspect malware, disconnect immediately. This stops it from spreading or communicating with attackers.
  • Unplug ethernet cable OR turn off WiFi
  • This is safe to do—it won't damage your computer

Step 2: Don't Ignore It, But Don't Panic Either

  • Most viruses don't destroy your data immediately
  • Disconnecting from the internet stops the immediate threat
  • You have time to address this carefully

Step 3: Change Important Passwords (On a Different Device)

  • If there's any chance malware saw you typing, change passwords on a phone or different computer
  • Focus on: email, banking, social media, payment apps
  • Do this on a device you trust hasn't been compromised

Step 4: Write Down What You Noticed

  • When did it start?
  • What were you doing when you first noticed something wrong?
  • Did you download or install anything recently?
  • Did you click on an email link?
  • This information helps identify the problem

Section 3: DIY Removal Steps

For Windows Users:

Step 1: Run Windows Defender (Built-In Protection)

  • Reconnect to internet
  • Open Windows Security (search for it)
  • Go to "Virus & threat protection"
  • Click "Scan options"
  • Select "Full scan"
  • Let it run (this takes 30+ minutes)
  • Restart when done

Step 2: Remove Suspicious Programs

  • Go to Settings > Apps > Apps & features
  • Look for programs you don't remember installing
  • Remove anything suspicious
  • Restart your computer

Step 3: Check Your Browser

  • Open each browser you use (Chrome, Edge, Firefox)
  • Check extensions (Chrome: menu > More tools > Extensions)
  • Remove anything you didn't install
  • Check your homepage and search engine settings—reset if changed
  • Clear browser cache and cookies

Step 4: Run a Second Opinion Scan

  • Download Malwarebytes (free version)
  • Run a full scan
  • Remove anything it finds
  • Restart

For Mac Users:

Step 1: Restart in Safe Mode

  • Shut down completely
  • Turn on and hold Shift key until login screen appears
  • Log in as usual
  • This limits what can run

Step 2: Check Your Applications

  • Open Applications folder
  • Look for programs you don't remember installing
  • Move suspicious ones to Trash
  • Empty Trash

Step 3: Check Browser Extensions

  • Safari: Preferences > Extensions > Remove unfamiliar ones
  • Chrome: Menu > More tools > Extensions > Remove unfamiliar ones

Step 4: Update Your OS and Software

  • Apple menu > System Settings > General > Software Update
  • Keep everything current

Section 4: When to Stop DIY and Get Professional Help

You should contact a professional if:

  • The full scan takes over 2 hours or freezes
  • Your computer won't start properly after removal attempts
  • Malware keeps coming back after removal
  • You're not comfortable with these steps
  • You're worried about important files being infected
  • You suspect ransomware (files encrypted, can't access them)

👉 [Contact Ultimate IT Guys - We Can Help]

Section 5: Prevention (So This Doesn't Happen Again)

  • Keep Windows/macOS updated—enable automatic updates
  • Don't disable your antivirus protection
  • Be careful with email attachments from unknown senders
  • Don't click links in unsolicited emails
  • Download software only from official websites
  • Use strong, unique passwords
  • Back up your important files regularly