My system doesn not much the current uploaded software it shows on start up disk that i have mac os 1.8 where the system is asking for 1.77

my system doesn not much the current uploaded software it shows on start up disk that i have mac os 1.8 where the system is asking for 1.77. It doesn't allowe me to reinstal or access the drive>

I assume you don't have a backup on an external HD. You always should, because then you could easily fix your problem.
Boot in Safe Mode. See What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392 Takes a while to run, but it usually "fixes" problems.
Safe Boot takes longer than normal startup
http://support.apple.com/kb/TS1884?viewlocale=en_US
 Cheers, Tom

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