Per
REDDAWG in this thread:
http://www.modmyi.com/forums/redsn0w...-wont-run.html
There have been many unresolved reports coming from people running 64-bit versions of Vista and Vista 32-bit systems. Below are steps how to disable User Access Control (UAC) and how to enable the real Administrator account in Microsoft Vista. Try the below steps and see if this helps resolve the Redsn0w.exe crashes or problems and report back your results.
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How to enable the Vista Administrator account
From the Start menu, simply right-click on Computer and choose Manage.
Next, expand Local Users and Groups and select the Users folder.
The final step is to right-click on the Administrator login and choose properties. Clear the Account is Disabled checkbox and you have now enabled your Administrator account.
Logout and then back in as the true Administrator account and see if Redsn0w works properly
Make sure you disable the Administrator account when finished.
How to disable User Account Control (UAC) on Windows Vista
Method #1 - Using MSCONFIG
Launch MSCONFIG by from the Run menu.
Click on the Tools tab. Scroll down till you find "Disable UAC" . Click on that line.
Method #2 - Using Search bar
The easy solution is through Control Panel.
Type "UAC" into the search bar at the top of the screen and you'll see this task presented:
Turn User Account Control (UAC) on or off
If neither work by themselves, try both together.
Make sure you disable the true Administrator account and re-enable UAC when done.
This fixed the issues that I had: I was getting : redsnow.exe has stopped working." errors 1/2 way before the install of redsn0w.
I hope this helps some. This info would also be helpfull in the first post. I spent a wile searching for this much needed info.