seals on my computer hl

[chungity]

sorri but now that i hav ur attention, sigseal144 earlier posted a similar problem to mine. he later posts he solved the problem but not saying how, i am still stuck. see, i try to install my half life and i click install but the disc spins and nothing happens, the pop-up menu just goes away. i've installed it before but now i donno why it wont. i tried the cd on my mom's laptop and it installled fine on hers but not here. any help?
thx!