[ubuntu-in] Gutsy problems on Athlon

[nan budh]

Guys please help me. suggest me what to do. i installed gutsy on athon 64 2800+. its freezing/ crashing/ becoming totally unresponsive at least half of the times i start it up. Often it happen when there is are two programs running like firefox and pidgeon or synaptic. Second problem is that the desktop menu bar gets discoloured in rectangular patches. colours ranges from gray to bright blue. at times the patch 'bleeds' down to the open firefox window.
I am not sure but i have a feeling that if i do clean install from alternative Cd maybe it will get resolved.
any thoughts welcome.
nanbudh
ps: during installtion i forgot to make one of my disk partitions as the home directory. please tell me how can i do it now. 

       
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