Uninstalling Xcode 3.0 in Snow Leopard

I recently installed Xcode 3.0, but I found out to upgrade to the latest version I had to uninstall the current version first. I read in the manual of Xcode that it could be done by typing the following command in terminal:
sudo /Developer/Library/uninstall-devtools --mode=all
but it gives me the following error:
ERROR: Can't locate uninstaller script /Library/Developer/3.0/uninstall-devtools
Can't determine system version.
Can't determine system version.
The file /Library/Developer/3.0/uninstall-devtools seems to be missing. even when I copy this file from /Library/Developer/shared/ to this directory I again get the error:
Can't determine system version.
Can't determine system version.
Any help is appreciated.

Reinstalling XCode 3.0 on 10.6 definitely doesn't fix this uninstall script - it's simply hard coded to not recognize 10.6. Also, installing XCode 3.2.1 does not "install over" XCode 3.0. I had at least 2 gigs less space than I previously had when I tried that, though 3.2.1 did work fine.
I'm not sure how safe it is, but on Snow Leopard I edited /Library/Developer/3.0/uninstall-devtools and just commented out (using the # symbol) the lines that check for system version, leaving the line that sets system version to 10.5 uncommented. Then I ran 'sudo /Library/Developer/3.0/uninstall-devtools' and it ran through the script without errors.
After that I dragged /Developer to the trash and emptied the trash. Rebooting showed no obvious errors. I installed XCode 3.2.1 and ended up with only a little less free hard drive space than when I had 3.0 installed. The new xcode installation seems to work fine.
I would recommend booting off the OSX install CD and using Disk Utility to make a disk image (.dmg) of your hard drive to an external drive that can be restored (also using Disk Utility from the boot disk) just in case all this breaks something on your system.

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It would be easier to just fix whatever is making your machine slow.
I wrote a little diagnostic program to help show what might be causing these problems. Download EtreCheck from http://www.etresoft.com/download/EtreCheck.zip, run it, and paste the results here.
Disclaimer: Although EtreCheck is free, there are other links on my site that could give me some form of compensation, financial or otherwise.

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regards

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iPhone Dev Center
Downloads
Read me before downloading
If you have updated your device to iPhone OS 3.1.3 with iTunes, you must install iPhone SDK 3.1.3 in order to continue with your development.
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Snow Leopard Build: 10M2003a
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iPhone SDK 3.1.3 with Xcode 3.1.4
iPhone SDK 3.1.3 with Xcode 3.1.4 Readme
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Thank you very much :-)
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Access Denied
If you need assistance, please contact the ADC Support Team.
If you feel you received this message in error, please reference this code when contacting the ADC Support Team: P1

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Message was edited by: 1AppleFan1

nvm Ray answered by answering another question

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Stacktrace:
Process: Xcode [1007]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.Xcode
Version: ??? (???)
Build Info: DevToolsIDE-16100000~6
Code Type: X86-64 (Native)
Parent Process: launchd [158]
Date/Time: 2009-12-01 17:28:24.581 -0500
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Report Version: 6
Interval Since Last Report: 46002 sec
Crashes Since Last Report: 7
Per-App Crashes Since Last Report: 7
Anonymous UUID: 8F708DA0-7DCB-45AF-8BEE-DE410AFA3021
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
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Library not loaded: @rpath/DevToolsFoundation.framework/Versions/A/DevToolsFoundation
Referenced from: /Applications/Xcode.app/Contents/MacOS/Xcode
Reason: image not found
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Graphics: NVIDIA GeForce 9600M GT, NVIDIA GeForce 9600M GT, PCIe, 512 MB
Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB
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Serial ATA Device: MATSHITADVD-R UJ-868
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0x24400000
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