[General Questions and Answers] sybreeder:
Have you read that ? :

Prerequisites
- Android 2.1 Firmware Login - (Please register to download)
- Odin Multi Downloader 4.03 Odin4_03-Spica_ops.zip
- Spica Drivers Deposit Files (If it doesn't work install Kies and quit Kies when you need to flash)
Or get http://www.strefapc.pl/download/firmware/USB_Driver.rar .This is samsung's USB driver that comes with KIES
- MicroUSB Cable
- Fully Charged Phone
Warning: DATA WILL BE LOST
A more detailed guide can also be found here written by Lorenz (This 3 flash method will also solve any 0KB issues)
Samsung I5700 Galaxy Spica Android 2.1 Flashing Guide | All About Web & Mobile Application Development

1. Backup all your data, copy down your APN settings etc (You can use backup apps which save those into your SD card)
2. Do a factory reset (Menu/App Drawer -> Settings -> Privacy -> Factory data reset)
3. Power off the phone, remove your SIM card and SD Card
4. Press and hold Volume Down, Camera and End Call buttons until you see "Downloading... DO NOT TURN OFF TARGET" (Flash Mode)
5. Connect the phone to your PC (It should start prompting for the drivers)
5-1. For Drivers choose "Select from a list or specific location (Advanced)"
5-2. Select the files that was extracted from "Spica Drivers" (If it fails, unplug the phone and install Kies, quit Kies then plug the phone back)
6. Run Odin Multi Downloader (For Vista and Win7 users please Right click and Run As Administrator) [A yellow box with a COM port should show up if connected correctly]
7a. If the zip you downloaded for Android 2.1 Firmware only contains 1 file check "One Package" and click on One Package to select that file you extracted
7b. If the zip you downloaded for Android 2.1 Firmware only contains many files click on each of the option and choose the files accordingly.
8. Select OPS and select the ops file that came with Odin Multi Downloader (It should be 85 bytes)
9. Select Start
10. The phone will start flashing and automatically restart (If it gets stuck remove the battery and set to flash mode and try again)
Note: it can take a while after it restarts.
11. Please check the storage and ensure it is not 0KB (Menu/App Drawer -> Settings -> SD card & phone storage -> Available space
If you have 0KB please follow this guide written by Lorenz
Samsung I5700 Galaxy Spica Android 2.1 Flashing Guide | All About Web & Mobile Application Development

And that?

Prerequisites
- Android 2.1
- Odin Multi Downloader 4.03 Odin4_03-Spica_ops.zip
- LK2.08 Kernel by LekshaK, Select "Download: i5700_LK2-08_PDA.7z" from http://forum.samdroid.net/f9/lk2-08-original-firmwares-root-new-superuser-wifi-tether-bb-12-07-2010-a-1193/
- Spica Drivers Deposit Files (If it doesn't work install Kies and quit Kies when you need to flash)
- MicroUSB Cable
- Fully Charged Phone

1. Backup all your data
2. Power off the phone, remove your SIM card and SD Card
3. Press and hold Volume Down, Camera and End Call buttons until you see "Downloading... DO NOT TURN OFF TARGET" (Flash Mode)
4. Connect the phone to your PC (It should start prompting for the drivers)
4-1. For Drivers choose "Select from a list or specific location (Advanced)"
4-2. Select the files that was extracted from "Spica Drivers" (If it fails, unplug the phone and install Kies, quit Kies then plug the phone back)
5. Run Odin Multi Downloader (For Vista and Win7 users please Right click and Run As Administrator) [A yellow box with a COM port should show up if connected correctly]
6. Select PDA and choose LK2-08 PDA file. (You have to extract i5700_LK2-08_PDA.7z)
7. Select OPS and select the ops file that came with Odin Multi Downloader (It should be 85 bytes)
8. Select Start
9. The phone will start flashing and automatically restart
10. You will then see a screen with green text, select the 1st option and restart the phone if you don't intend to do anything.
11. After restarting your phone should have a SamdroidTools and Superuser Permissions in the app drawer.

I never had a problem with flash spica using Odin. The drivers are compatibile with Win7 - i used Win7 64bit myself