HT2476 How do I upgrade from snow leopard 10.6.8 to lion 10.7?

I get an error message when tryin gto access the mac app store from my apple menu and any browser. I want to upgrade to iMovie '11 from '09. I also want to upgrade from snow leopard to lion.

Depends upon your machine if it can handle Lion or not.
Did you read the minimal specs? 2GB of RAM and a Intel Core 2 Duo (not Intel Core Duo) it really needs 4GB of RAM.
I don't advise any machine that came with 10.5 originally to upgrade to Lion, it's just too much for that older hardware and 10.8 is coming out very soon and that will not run on a lot of older machines so your behind again and having to buy all new software.
As you should know, your investment in PPC based software and hardware drivers for third party machines is not going to work in 10.7.
http://roaringapps.com/apps:table
Perhaps you might want to wait for a new 10.8 or 10.9 machine.
If your sure about Lion, I highly advise making a bootable clone on a blank external drive first, makes it a cinch to come back to Snow.
Or at least disconnect your TimeMachine drive so it stays on 10.6, then you can erase from the disk and restore from TM.
Most commonly used backup methods
Either that you will have to do it the "hard way"
How to revert your Mac to Snow Leopard
Try MAS again later, or get a faster Internet connection.

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    http://www.apple.com/osx/specs/
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