System freezes when attempting to upgrade from Snow Leopard to Lion

I hope someone can help me out there.  I have downloaded the Lion upgrade install program and built an install disk on my jump drive using Lion Diskmaker 2.0.2, but when I tried to upgrade from Snow Leopard to Lion using the jump drive, the install freezes at 24% and I cannot reboot or anything.  It just keeps coming back to the install screen.  Any suggestions?

This could be due to a number of causes. If you have the Lion installer application, then I suggest you put it in your Downloads folder. Now do this:
Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
When you've done the above you should now double-click on the Lion installer application in your Applications folder. When prompted click on the Install button. Note that you will not use the flash drive you made as you shouldn't need it. And, this will avoid any issues with a bad flash drive installer.

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