An unknown number of users have reportedly experienced serious difficulties migrating from Vista to Windows 7. Problems range from erroneously invalid product keys to endless reboot loops, which often prevent either operating system from loading. Indeed, one Windows user named Manjigani complained that the attempted upgrade had left his system in "limbo."

"My upgrade failed in last step. And now it is in continuous loop," wrote Manjigani in a post on Microsoft's official forum. "I let it run overnight hoping that it will fix itself, but no luck. I really don't want to go back and install Vista and then go to Windows 7." Another user known as "Derty" told a similar story.

"It's such a shame, too. All the promises of stability and simplicity and, now, there are so many problems with installation. I can't even access my laptop nor do I have the ability to roll my system back to Vista. All indications are the Install removed any trace of Vista. That's not good."

Read the entire article in TG Daily.