Yes, you'll have to boot into W7 and uninstall Rollback from within this OS to remove it completely from here as well.
You should do it in the following order
1. Uninstall Rollback from XP. This will require a reboot which you'll be prompted for. Make sure that you boot back into the same OS (XP in your case) to complete the uninstall process. The first OS you uninstall from is the longest uninstall process because it requires a reboot to remove the subconsole and update your system with the selected snapshot. The time taken for a system update process is dependent on when the last time you updated the baseline and how many changes were made since then. Times of half an hour or more are not uncommon.
2. After uninstall has completed successfully, reboot into W7 now.
3. You'll notice that the Rollback icon is greyed out. This is because the subconsole has been removed by the uninstall process you conducted while in XP. This is an expected result. To remove Rollback from W7, simply go to "START>ALL PROGRAMS>ROLLBACK RX>UNINSTALL".
4. During the uninstall you'll see no progress on what is happening (something Horizon should really look into improving). It might take about 30sec before something pops up telling you that the uninstall was successful so be patient.....its definitely doing something in the background. Once it completes then that's it. No reboot required unless you have other OS's to uninstall. These subsequent uninstalls are quicker because your only uninstalling the console from within Windows. All the hard work was done on the first uninstall (XP in your case).
5. It doesnt really matter which OS you uninstall from first. Just be sure to boot back into the same OS until the uninstall process is finished.
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