firefox won't open,downloaded new version, still won't work

Firefox will not open,I get a message saying it's crashed and would I like to report the problem, I have,several times. These are the details in the crash report..Add-ons: {3f963a5b-e555-4543-90e2-c3908898db71}:9.0.0.845,avg@igeared:4.504.019.002,{ACAA314B-EEBA-48e4-AD47-84E31C44796C}:1.0.1,{872b5b88-9db5-4310-bdd0-ac189557e5f5}:2.7.0.14,{3112ca9c-de6d-4884-a869-9855de68056c}:7.1.20100830W,{CAFEEFAC-0016-0000-0005-ABCDEFFEDCBA}:6.0.05,{CAFEEFAC-0016-0000-0003-ABCDEFFEDCBA}:6.0.03,{CAFEEFAC-0016-0000-0007-ABCDEFFEDCBA}:6.0.07,{CAFEEFAC-0016-0000-0011-ABCDEFFEDCBA}:6.0.11,{CAFEEFAC-0016-0000-0015-ABCDEFFEDCBA}:6.0.15,{CAFEEFAC-0016-0000-0017-ABCDEFFEDCBA}:6.0.17,jqs@sun.com:1.0,{20a82645-c095-46ed-80e3-08825760534b}:1.1,{C2DCA7EB-22D2-4FD2-86A9-F99FCC8122BB}:2.2.9,{ABDE892B-13A8-4d1b-88E6-365A6E755758}:1.1.3,{972ce4c6-7e08-4474-a285-3208198ce6fd}:3.6.10 BuildID: 20100914125854 CrashTime: 1285419016 EMCheckCompatibility: true Email: ******@*****.*** FramePoisonBase: 00000000f0de0000 FramePoisonSize: 65536 InstallTime: 1285418914 ProductName: Firefox ReleaseChannel: release SecondsSinceLastCrash: 412 StartupTime: 1285419006 Theme: classic/1.0 Throttleable: 1 URL: http://www.mozilla.com/en-US/firefox/3.6.10/whatsnew/ Vendor: Mozilla Version: 3.6.10 On trying to install a new version,I got this message.. Firefox could not install this item because "install.rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.