Have lion on 5 year old 20" mac desktop. tried to download and received a message mountain lion not compatible with this computer. anyone else have this problem?

have lion 10.7.4 up graded from tiger 10.5.8. tried to download mountain lion but received a message that mountain lion is not compatible with my computer. anyone have this problem or suggestion?

It's actually not the chip... it's the drivers for the video card. this is what my friend who does IT work said.
"The drivers for your Mac's video card are not 64bit compatible even though the computer itself is. Mountain Lion has done away with all 32bit OS components so it only runs on full 64bit MAcs now"
So even though I updated my video card to a newer version and my computer itself is 64bit... apple didn't create a driver for it that was 64 bit. My hardware is fine for this update and the chip can handle it. It can handle all my 64 bit programs just fine. It's apple forcing me to update and buy a new expensive computer. So much for long lasting computer... they last long but they won't be supported very long.
Why not release a version of mountain lion that supports 32 bit graphics alongside the 64 bit? Wasn't that what grand central was going to accomplish? This is rubbish.

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