will not boot



I have an iMac, apparently i got a virus or something so i decided to just reinstall OS X, so i put the install cd #1 in, press C, and did an install, formatting the partition , ive tried many ways, just on one partition, and by itself, no ways helped, then when it would reboot after installing, it would hang at a blue screen where i can still move my mouse.

its driving me crazy any help would be greatly appreciated

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