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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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marked as duplicate by Nifle, Mehper C. Palavuzlar, grawity, BinaryMisfit Sep 5 '10 at 9:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 1 down vote accepted

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. – grawity 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

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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