My friendly recently called me in a panic: her computer was making a load screeching noise and her screen was telling her to not touch anything but rather call this "Microsoft" tech repair number.
This was a scam. The entity creating this screen and noise were a scam to get people to pay for anti-virus software.
Below is what the screen looked like. Don't fall for this. This is the number they told her to call:
1-855-383-8420
You can Google this telephone number and you'll find similar horror stories about this company.
The screen says:
The page at alert.norton.com.ok-po-alert.com says:
* * * Computer Health Alert * * *
Your Browser Detected Security Error. Due to Suspicious Activity Found on Your Computer. Contact Microsoft Certified Live Technicians
1-855-383-8420 (Toll-Free)
The screen also says the computer is infected with "Trojan" and "SpyWare.bot". That was not true.
After calling, they try to get you to subscribe to their bogus services.