I just ran the web installer for VS2010 SP 1 with the following parameters. That forced it to uninstall and got me past the blocking issue:
VS10sp1-KB983509.exe /uninstall /force
I just ran the web installer for VS2010 SP 1 with the following parameters. That forced it to uninstall and got me past the blocking issue:
VS10sp1-KB983509.exe /uninstall /force