PHP error on new Magento installation

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I just tried to install Magento. cPanel completes the process normally and says it's OK - but while trying to log in, I only get the following error message. I uninstalled the program and re-installed, but it did not help. What's wrong?

Fatal error: session_start() [function.session-start]: Failed to initialize storage module: user (path: /tmp) in /home/eaiand5/public_html/kaktusepood/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php on line 125

I have taken into your account and it appears that you may be running a different version of PHP than Magento requires. Try changing your PHP version and see if it is working correctly. Please also keep in mind that Magento is extremely resource intensive and may require a VPS or dedicated server depending on the traffic that reaches it.