not able to upgrade to 2.8.0

i'm trying to upgrade my current STS 2.7.1 installation to 2.8.0 and it throws an error as below.

Code:

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cannot complete the install because of a conflicting dependency.
  Software being installed: SpringSource Tool Suite 2.8.0.201110171000-RELEASE (com.springsource.sts.ide 2.8.0.201110171000-RELEASE)
  Software currently installed: Shared profile 1.0.0.1310711647973 (SharedProfile_com.springsource.sts.ide 1.0.0.1310711647973)
  Only one of the following can be installed at once:
    SpringSource Tool Suite 2.8.0.201110171000-RELEASE (com.springsource.sts.ide 2.8.0.201110171000-RELEASE)
    SpringSource Tool Suite 2.7.1.201107091000-RELEASE (com.springsource.sts.ide 2.7.1.201107091000-RELEASE)
  Cannot satisfy dependency:
    From: Shared profile 1.0.0.1310711647973 (SharedProfile_com.springsource.sts.ide 1.0.0.1310711647973)
    To: com.springsource.sts.ide [2.7.1.201107091000-RELEASE]

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can someone tell me what is the meaning of this error..

Thanks.

Regards,
Venky

Your STS is installed in a read-only location. You need to either move it or give the current user write privileges in order to perform the update. If you are on windows and have installed into C:\Program Files, then you must move your install. You shouldn't need to delete, just a move should work.