Can't jailbreak after downgrade!!

[Roflcopterrr]

I followed all of the instructions - I used iRecovery in windows to set autoboot to true by doing

"setenv auto-boot true
saveenv
/exit"

And when I try to jailbreak with either redsn0w or purplera1n, they both crash mid-jailbreak, and restarting the jailbreak / restoring and doing everything over doesn't fix it.

Help!

EDIT: Odd, redsn0w just worked on it's own!

[L00i3]

I don't know what the deal is, but I had an issue like that with redsn0w a while back. After 2 uneventful jailbreaks on my Vista Ultimate (x86) desktop, the next time I restored, redsn0w would continuously "stop working" according to Windows (gotta love windows/ helpful crash dialogues). So I put redsn0w on my Vista home premium (x64) laptop and everything worked fine. Not sure if this is any help to you or not, but it's what worked for me.