DropDown Menus Vanish & Re-Appear

I'm on newest stable version of Ubuntu but my drop-down menus in Firefox barely work and my volume is flipping out. It's hard to adjust and i've done all recent updates for my system but no luck. Has any1 heard of this issue b4?? Thx much.

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System Details

Ubuntu 13.04 on Pentium D 2.8GHz x2 CPU w/ intel 945G x86 and 32bit 240GB Disk. Thx again, guyz.