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Helpful answers
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Mar 15, 2012 9:02 AM in response to Oliemanby a brody,Upgrade to 4 GB of RAM, making sure to meet specs*:
http://www.macmaps.com/badram.html
Repair permissions with Applications -> Utilities -> Disk Utility.
Backup your data*:
http://www.macmaps.com/backup.html
And determine if one of these updates applies to you:
https://discussions.apple.com/docs/DOC-3011
If none of those help, did you install on top of a system that had used Rosetta based drivers that no longer work? If you did, an erase and install of Lion might help, and only installing t hose drivers that are known to be compatible with Lion.
Make sure any WiFi router you have has the correct firmware for Lion
Make sure the disk isn't too full*: