Received three calls in the space of a week from this phone number. Each time I answer the caller hangs up. Annoying!

They're still doing it with the same number. For me they called themselves esolving.com

recieved a call from them "Online PC Care" on 17/10/2011.
They tried to get me to make system adjustments on my computer

I had a call from these guys today too.  I've had a few recently and i love playing with them.  I'm an IT Manager and very Windoze literate.  Like David - UK, i just got him to talk me through the event Viewer while i stood outside and had a smoke.  
I think I wasted about 20 minutes of their time - feeding them b*llsh*t all along, although they were saying this was a "free checkup".  I went through three operators in all.  None of them were real windoze users, and obviously reading from a prepared script.
But i love the suggestion of getting a URL for them and then telling them it is a phishing site, I'll use that one next time.
Yes, I'm bored at home and easily entertained.  The last fellow i spoke to didn't really understand what i meant when i explained in great detail what he should do with the 8" carrot from his fridge.  ROFL

The call I just received came from a blocked number, but the story is the same. "On line PC care" -- but I stopped him immediately by informing him he was breaking the law by calling me (CRTC do-not-call list in Canada). The call was obviously from overseas; there was a strong echo and a delay. I caught the alleged company name but not his name; he had a marked Asian accent. He was extremely polite, some problem with my name and do-not-call, he will make sure I get no more calls. Bushwah, says I. They are not using the Canadian do-not-call list, which they don't have to do because they are outside Canada.

Of course, had I been clairvoyant and seen this discussion first, I would have let him continue to see what he was after! Thanks to the knowledgeable people reporting these activities.

I have just received calls this week from a company that I was suspicious of.  The caller had an Asian accent and spoke quite quickly.  He said his name was "Ron" (could by Ryan) and he was from "Computer Maintenance ........... Health.....Department".  I asked him to repeat the name of the company several times with no improvement.  My caller ID said he was from "Overseas".  So much for being on the "Do Not Call Register".

He knew my name and that I had had some errors/problems recently.  I reluctantly told him I had but only when I had used Skype (will be removing that now).  He started to tell me that my computer was full of malicious software etc.  When I told him I have virus software he made some sort of dismissive comment that annoyed me and rang alarm bells.  He then started to tell me what I should do to fix my computer, however, between the speed of his speech and his accent I couldn't understand him.

I then told him that my father is a computer technician (very true) and that he had looked at my computer and I knew what was needed to fix the problems.

"Oh, your father is a computer technician?" said he.  
"Yes" said I.
"Ok ma'am.  Have a nice day." says he and promptly hangs up!

This company can obviously intercept error reports that are supposed to go to Microsoft.  I won't be sending anymore.  Just in case this crowd is in with Skype, I won't be using that programme anymore.

The caller made the company sound "official", "legitimate" and I am concerned that many people would fall for this scam.

Fortunately, I am immediately suspicious of anyone I don't know coming to my door or ringing me.

This phone number was given to me by a cold caller claiming to be Brad Wilson from the "Global Computer Maintenance Department" of "Online PC Care" to perform my "Microsoft Windows Maintenance".

Brad had me access several log files on my PC and showed me a "hidden directory containing malicious file downloads". After accessing one log he actually spat out an "Oh, God!".

The logs and directory all contained benign information that is stored as part of my PC's day-to-day functions.  His claims about my PC containing "harmful files that my anti-virus could not pick up" were a complete fabrication.  Everything he said was misleading, alarmist or just plain false.

The icing on the cake - "Your computer is full of malicious files and that's what is causing it to run slow, I'm going to put you through to one of our Microsoft Certified Technicians to fix this up for you.  First, though, I need you to install a Microsoft Security Update..."

This "Maintenance" is a complete scam.  It's a ploy to have you install third-party software that does who-knows-what on your machine.  Apart from the obvious problems with remote access, this "security update" could include other functions that might disable your anti-virus, record internet habits, personal information or worse, keystrokes (ie, passwords).

If you receive a call from this mob:
- Take their details
- Get a "call-back" number
- Report them to consumer affairs!

Ur A Mother F***er..!!

Caller had foreign accent. Very difficult to understand. Said his name was Jim Smith. He said he understood I was having problems accessing the internet and Microsoft had him contact me. I did not get a phone number or enter information he wanted me to do. I told him I would check on it and for him to call me back later.