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Possible Duplicate:
Windows Updates Folders (With Strange Names) in C drive

I don't know what are they and if it's ok to delete them. These are the folders:

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These are the files that each of the folders contains:

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edit: as per comments below, these are of course temp files, not rollback files as I incorrectly stated WRONG: These files are kept in case you want to roll back a windows update. Depending on how likely it is that you would ever want to do that and how old these files already are, you could probably bin them.

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    Rollback information is stored in %SystemRoot%\$NtUninstallKB<id>$. These are just temp files. – user1686 Sep 4 '10 at 14:07
  • Since Windows 98 that kind of strange folders are created in drive root... – kokbira Mar 21 '11 at 11:59
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Those folders are where Windows Updates are unpacked before installation. Usually they are removed automatically, but if they aren't - reboot (to make sure) and delete them yourself.

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