OSX 10.7.4 freezers on login screen

i have mid-2010 macbook pro , i've noticed several freezes on login screen: gets on login screen , multicolored spinning ball appears , not able authenticate.. thing can force shutdown power button. see messages before forced shutdown:

code:

  29/06/12 21:53:05,000          kernel          nvda(opengl): channel exception! exception type = 0x6 = fifo: parse error  29/06/12 21:53:05,000          kernel          iovendorglcontext::reportgpurestart  29/06/12 21:53:05,000          kernel          nvda(opengl): channel exception! exception type = 0x6 = fifo: parse error  29/06/12 21:53:05,896          sandboxd          ([226]) dumpgpurestart(226) deny network-outbound /private/var/run/mdnsresponder  29/06/12 21:53:21,624          usereventagent          servermgr_certs[202] -[certsrequesthandler(helperadditions) identitiesfromkeychain:]:          secitemcopymatching (err = -25300)  29/06/12 21:53:21,630          com.apple.usereventagent-system          secitemcopymatching: impossibile trovare nel portachiavi l’elemento specificato.  29/06/12 21:53:21,633          usereventagent          servermgr_certs[202] -[certsrequesthandler(helperadditions) identitiesfromkeychain:]:          secitemcopymatching (err = -25300)  29/06/12 21:53:21,633          com.apple.usereventagent-system          secitemcopymatching: impossibile trovare nel portachiavi l’elemento specificato.  29/06/12 21:53:21,634          usereventagent          certskeychainmonitor: ready process keychain & timer events  29/06/12 21:53:25,000          kernel          nvda(opengl): channel timeout!  29/06/12 21:53:37,000          kernel          appleintelframebuffer vbl interrupts lost deisr 00000010 deimr 7cdfff7f deier 83200080  

the following full report of dumpgpurestart event:

code:

  dumpgpurestart(226) deny network-outbound /private/var/run/mdnsresponder    process:         dumpgpurestart [226]  path:            /system/library/frameworks/opengl.framework/versions/a/libraries/dumpgpurestart  load address:    0x104d15000  identifier:      dumpgpurestart  version:         ??? (???)  code type:       x86-64 (native)  parent process:  launchd [1]    date/time:       2012-06-29 21:53:05.465 +0200  os version:      mac os x 10.7.4 (11e53)  report version:  7    backtrace:  0   libsystem_kernel.dylib        	0x00007fff92feb57e __connect_nocancel + 10  1   libsystem_dnssd.dylib         	0x00007fff8d877448 connecttoserver + 829  2   libsystem_dnssd.dylib         	0x00007fff8d878e9d dnsservicecreateconnection + 50  3   libsystem_info.dylib          	0x00007fff93ac307d _mdns_search + 1689  4   libsystem_info.dylib          	0x00007fff93ac38b7 mdns_addrinfo + 615  5   libsystem_info.dylib          	0x00007fff93ac4151 search_addrinfo + 152  6   libsystem_info.dylib          	0x00007fff93ac7a1c si_addrinfo + 1614  7   libsystem_info.dylib          	0x00007fff93ac922a si_list_call + 294  8   libsystem_info.dylib          	0x00007fff93ac9050 __si_async_call_block_invoke_1 + 96  9   libdispatch.dylib             	0x00007fff88afaa86 _dispatch_call_block_and_release + 18  10  libdispatch.dylib             	0x00007fff88afb965 _dispatch_worker_thread2 + 255  11  libsystem_c.dylib             	0x00007fff894a33da _pthread_wqthread + 316  12  libsystem_c.dylib             	0x00007fff894a4b85 start_wqthread + 13    binary images:      0x7fff88af9000 -     0x7fff88b07fff  libdispatch.dylib (187.9.0 - compatibility 1.0.0) <1d5be322-a9b9-3bce-8fac-076fb07cf54a> /usr/lib/system/libdispatch.dylib      0x7fff89453000 -     0x7fff89530fef  libsystem_c.dylib (763.13.0 - compatibility 1.0.0) <41b43515-2806-3fbc-acf1-a16f35b7e290> /usr/lib/system/libsystem_c.dylib      0x7fff8d875000 -     0x7fff8d87dfff  libsystem_dnssd.dylib (??? - ???) <d9bb1f87-a42b-3cbc-9dc2-fc07fcef0016> /usr/lib/system/libsystem_dnssd.dylib      0x7fff92fd5000 -     0x7fff92ff5fff  libsystem_kernel.dylib (1699.26.8 - compatibility 1.0.0) <1ddc0b0f-db2a-34d6-895d-e5b2b5618946> /usr/lib/system/libsystem_kernel.dylib      0x7fff93aad000 -     0x7fff93ae8fff  libsystem_info.dylib (??? - ???) <35f90252-2ae1-32c5-8d34-782c614d9639> /usr/lib/system/libsystem_info.dylib  

can software issue related nvidia drivers? idea? did ever experienced error?

 

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