I used the DOS version of SoftICE on a retail Windows 95 machine, to circumvent the upgrade prevention check in Windows 95 OSR2. OSR2 was an OEM only release, b

I used the DOS version of SoftICE on a retail Windows 95 machine, to circumvent the upgrade prevention check in Windows 95 OSR2. OSR2 was an OEM only release, but I figured there had to be a way. Setting breakpoints and single stepping through the setup, I discovered that it checked for krnl386.exe. If that for existed, it was considered an upgrade. If you were a clever young hacker, you renamed that file and went ahead with the upgrade.