Please help - computer is crashing & freezing ever since upgrade to Leopard

Question

Ever since upgrading to Leopard, my computer has been crashing a lot more. Sometimes it just freezes up. Most recently, I got the gray screen with a bunch of different languages telling me to restart using the power button. Here is the crash report. Can anyone tell me what's going on, and if there's anything I can do to help?
Thanks!
Tue Mar 24 13:00:49 2009
panic(cpu 0 caller 0x001A9C68): Kernel trap at 0x0040de14, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0x000002c0, CR3: 0x0108a000, CR4: 0x00000660
EAX: 0x06745c00, EBX: 0x2e583bf0, ECX: 0x06745ccc, EDX: 0x00000000
CR2: 0x000002c0, EBP: 0x2e583bd8, ESI: 0x04866d00, EDI: 0x06745c00
EFL: 0x00010206, EIP: 0x0040de14, CS: 0x00000008, DS: 0x01880010
Error code: 0x00000000
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x2e5839e8 : 0x12b4f3 (0x45b13c 0x2e583a1c 0x1335e4 0x0)
0x2e583a38 : 0x1a9c68 (0x464700 0x40de14 0xe 0x463eb0)
0x2e583b18 : 0x1a038d (0x2e583b30 0xb6dcfb0 0x2e583bd8 0x40de14)
0x2e583b28 : 0x40de14 (0xe 0x48 0x2e580010 0x140010)
0x2e583bd8 : 0x7474b9 (0x6745c00 0x0 0x0 0x0)
0x2e583c48 : 0x747547 (0x6745c00 0x4866d00 0x9a00780 0x19eb5b)
0x2e583c68 : 0x5db609 (0x4866d00 0x4 0x46 0x136b31)
0x2e583cc8 : 0x5db679 (0x5a30600 0x4866d00 0x2 0x2)
0x2e583d08 : 0x34773463 (0x5a30600 0x4866d00 0x2 0x2)
0x2e583d28 : 0x60b211 (0x5a30600 0x4866d00 0xe0004051 0x1f)
0x2e583d98 : 0x85b117 (0x3c29000 0x3d88900 0xe0004051 0x1f)
0x2e583e38 : 0x85c047 (0x3c29000 0x3e79488 0xe0004051 0x0)
0x2e583e88 : 0x85c1b4 (0x3c29000 0x3e785c0 0xc954252c 0x7f33)
0x2e583ec8 : 0x6078f7 (0x3c29000 0x3e8 0x53f69c 0x3e10a40)
0x2e583f28 : 0x424cb8 (0x3c29000 0x3d68b00 0x53f0c0 0x1)
0x2e583f78 : 0x13eed2 (0x3d68b00 0x3d68919 0x0 0x0)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBMassStorageClass(2.0.4)@0x34772000->0x3477bfff
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(2.0.5)@0x5d5000
dependency: com.apple.iokit.IOUSBFamily(3.2.7)@0x606000
dependency: com.apple.iokit.IOStorageFamily(1.5.5)@0x72d000
com.apple.iokit.SCSITaskUserClient(2.0.5)@0x745000->0x74afff
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(2.0.5)@0x5d5000
dependency: com.apple.iokit.IOStorageFamily(1.5.5)@0x72d000
com.apple.iokit.IOSCSIArchitectureModelFamily(2.0.5)@0x5d5000->0x5edfff
com.apple.driver.AppleUSBEHCI(3.2.5)@0x851000->0x862fff
dependency: com.apple.iokit.IOPCIFamily(2.5)@0x636000
dependency: com.apple.iokit.IOUSBFamily(3.2.7)@0x606000
com.apple.iokit.IOUSBFamily(3.2.7)@0x606000->0x62efff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9G55
Kernel version:
Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386
System model name: MacBookPro2,2 (Mac-F42187C8)

Answer 1

I'd suggest doing this:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X 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 Installer menu (Utilities menu for Tiger.) 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, then quit DU and return to the installer.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.