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Windows Updates Folders (With Strange Names) in C drive

I have a folder named "ed6b7b66d9c1d645bfce0f8b33c3" under C: of Windows 7. I was wondering what its purpose is and if it is safe to delete? Thanks!

It takes up 120 MB. Its content is as follows: enter image description here

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The answers have all got this right. I would point out that some MS updates will act funny if you delete these folders THEN try to uninstall them (although I'm not aware of any that would actually be broken or anything that severe) – Shinrai Feb 3 '11 at 19:14
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closed as exact duplicate by Sathya♦ Feb 4 '11 at 3:37

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

3 Answers

up vote 12 down vote accepted

Googled the KBxxxxxx numbers, shows that the folder contains a .NET Framework setup.

It is safe to delete as it is solely an installer...

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up vote 5 down vote

Yes it is safe to delete, those odd numbered folders on the root of C are leftovers from Microsoft patches, upgrades or installers, sometimes they do not get cleaned up when it is done installing.

It appears it was left over from a Microsoft NET framework installer

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up vote 3 down vote

Looks like setup files of an application. Some setup applications extract themselves to a directory and start the installation from that location. That's one of them. Start setup.exe to find out what it is. If you have the original setup then you can safely delete.

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