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Hello. Thanks for all your emails about the clock.

Everyone got an extra hour on Sunday when the clocks went back. I hope you enjoyed yours; mine just seemed to fritter itself away (probably on Twitter).

But changing the hours always causes, er, a minute problem.

The clocks have to be changed. Everywhere.

That includes the video recorder. And the oven. And the central heating boiler.

And don't start me about the clock on the car dashboard. Could it be any more difficult? I'm sure the real reason families have two cars is so they can keep one on summer time, and the other on winter.

So I probably should not have been surprised to get some indignant emails after Monday's programme.

"Your on-screen clock is wrong!" you complained.

I have to confess, I didn't immediately realise what you were talking about. "What on-screen clock?" I thought. "This isn't Breakfast TV. We don't have one."

Aha. But we do.

It's on the stock market display. That thing we show you - oh - only every day that we're on air.

And while the Working Lunch stock markets computer is fully up-to-speed with the second-by-second movement in stock prices around the globe, the passing of the seasons passes it by. Unless we tweak it, every day is summertime for our markets computer.

Anyway - it's fixed now. I tried to do it myself, but was defeated by the security passwords.

So we sent for someone who knew what they were doing.

That's pretty much how we handled my weekly trip to the tech shed this Tuesday.

We looked at the launch of Microsoft's new operating system, Windows 7.

I spend lots of time, money and enthusiasm on new programmes for my computer. But I don't give any thought at all to the operating system that enables all those programmes to work.

When I switch my computer on, I expect it to work. Quickly.

My many friends in computer science are horrified by this. They get alternately enthused and enraged by the different operating systems. For some of them, Windows is the soul of popular computer. For others, it's the creation of a bug-loving, spam-ridden devil.

For those in the know, this is a subject that excites strong passions. Good. People should be passionate about important things.

But when we look at technology, it's not for the benefit of specialists. It's for people who like gadgets and technology, who are comfortable using them, who want them to save time and money - but who don't need to think about what goes on behind the screen.

So when we sent for someone to explain the topic, his job was to tell me - why should my Dad care about this? Why should he have to think about his operating system? And if he does need to change it, how does he go about doing it?

Agent Fran from the Geek Squad answered all that very well, I thought.

We talked a lot about Microsoft's Windows. Like it or not, it powers the vast majority of the world's PCs. Our viewers are much more likely to use Microsoft than anything else, so it's right and proper that it dominated the discussion.

He and I also said - several times - that there were alternatives to Microsoft. Fran also demonstrated Google's Android os.

Some of you think he should have given a much more detailed list of all the competing operating systems.

James Norris emailed, "There are real full desktop and laptop alternatives to Windows but these were not even given a mention. The problem with this sloppy and ill informed journalism is that to people that are not aware of the alternatives out there would be left to think that Android is really the only (one)."

He thinks we should have mentioned the Linux operating system. It certainly has its fans.

John Maltby emailed to praise it.

"In the interest of helping viewers to save money perhaps you might consider giving the Linux operating system a little more coverage," he wrote.

"Not only is it free but it is now stable and in practically all areas equal to Windows (whichever version) if not superior. I am not a geek but a mere user who migrated from Windows several years ago."

Malcolm Collins also weighed in on behalf of Linux - used all the time by his grandchildren, he says.

"Linux is another operating system, rarely mentioned, which has many variations. All very easy to install on modern computers and ALL 100% FREE. This OS is also almost completely virus free and does not require you to purchase anti virus software too. Another big saving every year."

And there was criticism of other systems. Peter Stott has a Mac, and recently upgraded from Panther to Leopard operating systems. He thinks this was a completely unnecessary change, forced on him by Apple to make him "fork out a large sum of money".

As I said - strong passions. Thanks for all your emails. Please do continue the discussion in the comments.