What happened?

[Spydergsx]

Last night i bought this magazine that is supposed to be the hadrware and tweaking "BIBLE". So i opened it up and started reading and wanted too try some things on my computer. So i did some tweaking, downloaded a few programs such as winboost, powertweak, and powrtoys. So i started tweaking and i eventually came to a restart point so i restarted and it says non-system disk or disk error, but there is no disk in the disk drive.???????????What causes that? The only thing i can think of is that i changed the setting in windows for the hard drive to be dma. Which i don't even know if the hard drive was dma compatible. So now i'm sitting here installing Dos 6.2 because i don't have the windows cd-rom. I had the cab files on my second hard drive. Here is one more question. Will that have screwed up my second hard drive too which is dma compatible?

[Spydergsx]

Well, thanks for all the feedback, but i answered my own question. The second hard drive was fine, but the first one i think is toast. I tried installing dos and it installed, but it froze on the startup
so i made the slave the master and disabled the othe and used a bott disk and luckily all of my info was still there. So i installed win98 and i am back up and running. Thanks alot!