weird folders on root drive

I was cleaning up my computer for more space on the hdd, and on the root folder I have severl weird folders, I believe they are from windows update the names are for example:
a3a41046b37f89a26fa5ba56
dc71b4a4b506b50ef3a1090881
e4aa78e85a03aeab249515a8fd
etc
 inside there is an file named spinstall and a folder with a weird name sucha as the ones in the example above. the folders are over 1GB each and have the same content. what are they? can I delete them?
Im running windows 7 Ultimate

Many thanks
Diego_JaenAsked:
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ErikCamachoCommented:
You may not be able to uninstall updates, but otherwise safe to delete
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madhatter5501Commented:
safe to delete
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web_trackerComputer Service TechnicianCommented:
The folders with a long string of strange letters are usually updates that are installed such as service packs, they can be safely deleted if the service pack has been successfully installed. Beware that if you deleted a windows update folder, and wanted to go back to a restore point if that folder is missing it may prevent your system from going back to a previous restore point. Other than that it is pretty safe to delete the folders.
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mrklaxonCommented:
Basically they are the temp folders used during a patch update and can be deleted.  Usually little space used by them though if the patch installed correctly.
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Diego_JaenAuthor Commented:
thanks to all of you, you have been very helpful, indeed the service pack 1 has never been successfully installed though it has been attempted many many many times. I have deleted  the  folders now, got 10GB of space back.
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