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These are computer Techs scammers trying to dupe you sign contract which is unnecessary. Don't even answer the call.

They are fake computer techs - no legitimate, reputable tech repair service cold calls you to say you have computer problems - I mean, how would they even know?  More information on this scam here:

http://www.microsoft.com/security/online-privacy/avoid-phone-scams.aspx

Cybercriminals don't just send fraudulent email messages and set up fake websites. They might also call you on the telephone and claim to be from Microsoft. They might offer to help solve your computer problems or sell you a software license. Once they have access to your computer, they can do the following:

Trick you into installing malicious software that could capture sensitive data, such as online banking user names and passwords. They might also then charge you to remove this software.

Take control of your computer remotely and adjust settings to leave your computer vulnerable.

Request credit card information so they can bill you for phony services.

Direct you to fraudulent websites and ask you to enter credit card and other personal or financial information there.

Neither Microsoft nor our partners make unsolicited phone calls (also known as cold calls) to charge you for computer security or software fixes.

Telephone tech support scams: What you need to know
Cybercriminals often use publicly available phone directories so they might know your name and other personal information when they call you. They might even guess what operating system you're using.

Once they've gained your trust, they might ask for your user name and password or ask you to go to a website to install software that will let them access your computer to fix it. Once you do this, your computer and your personal information is vulnerable.

Do not trust unsolicited calls. Do not provide any personal information.

Here are some of the organizations that cybercriminals claim to be from:

Windows Helpdesk

Windows Service Center

Microsoft Tech Support

Microsoft Support

Windows Technical Department Support Group

Microsoft Research and Development Team (Microsoft R & D Team)

Report phone scams
Learn about how to report phone fraud in the United States. Outside of the US, contact your local authorities.

How to protect yourself from telephone tech support scams
If someone claiming to be from Microsoft tech support calls you:

Do not purchase any software or services.

Ask if there is a fee or subscription associated with the "service." If there is, hang up.

Never give control of your computer to a third party unless you can confirm that it is a legitimate representative of a computer support team with whom you are already a customer.

Take the caller's information down and immediately report it to your local authorities.

Never provide your credit card or financial information to someone claiming to be from Microsoft tech support.

What to do if you already gave information to a tech support person
If you think that you might have downloaded malware from a phone tech support scam website or allowed a cybercriminal to access your computer, take these steps:

Change your computer's password, change the password on your main email account, and change the password for any financial accounts, especially your bank and credit card.

Scan your computer with the Microsoft Safety Scanner to find out if you have malware installed on your computer.

Install Microsoft Security Essentials. (Microsoft Security Essentials is a free program. If someone calls you to install this product and then charge you for it, this is also a scam.)

Note: In Windows 8, Windows Defender replaces Microsoft Security Essentials. Windows Defender runs in the background and notifies you when you need to take specific action. However, you can use it anytime to scan for malware if your computer isn’t working properly or you clicked a suspicious link online or in an email message.

Learn more about Windows Defender

Will Microsoft ever call me?
There are some cases where Microsoft will work with your Internet service provider and call you to fix a malware-infected computer—such as during the recent cleanup effort begun in our botnet takedown actions. These calls will be made by someone with whom you can verify you already are a customer. You will never receive a legitimate call from Microsoft or our partners to charge you for computer fixes.

More information
For more information about how to recognize a phishing scam, see Avoid scams that use the Microsoft name fraudulently.

If you need help with a virus or other security problem, visit the Microsoft Virus and Security Solution Center.

To help protect against viruses and other malicious software, download Microsoft Security Essentials.

Windows 8 includes antivirus protection that’s turned on by default.

Be aware there are similar looking Software services companies. This Legacy Soft Inc is one of the most cheating with false information and may even have colluding staff member with real soft ware support companies. There is women sounds British most dishonest person want to resolve the problem. Other techs sound Indians. Never answer the number. These are sophisticated scammers.

Had a call from this phone number, Nicholas Campbell, who took over my Mac computer. I am embarrassed to say I fell for his scam. I had to go close my checking account.

i got a call from computer security. merchant name: management kamboj inc they soaked me for thousands of dollars that i really needed for bills. i wrote down all the information they gave me and their tech support number is on the bottome of my computer screen. is there a way i can get those thousands of dollars that got from me? please advise me what to do.

I received a call from a company representing themselves as my computer security people. Foolishly I fell for the scam and and they informed me by showing me in my computer use of child porn, password breaches and banking information risks and they were very convincing and I almost lost $300 in repair payment. After the call I immediately stopped payment on my check and had my bank accts. closed and reopened new ones. After all, what reputable company has payment address in Canada made payable to Management Kamboj Inc. I'm usually pretty savvy about these things, but these guys are good...BEWARE!!

Quote:

they informed me by showing me in my computer use of child porn, password breaches and banking information risk

You let them into your computer?  They probably installed malware while they were there.  Take your computer to reputable local computer repair shop and tell them what you told us.  Pay them to undo the damage.

How would they show you "use of child porn"?

They did a scan remotely and "child porn" came up..I'm so humiliated I fell for this scam!

Informed my computer was compromised. Convinced me to get it cleaned up. Went into my computer. Cost $1800 for service. I am such a fool!