"a disk reading error occured"

hi.
Well basicly my computer is having another spaz. Now, whenever i turn on my pc (not this one), it comes up with the error saying:

a disk reading error occured
press CTRL + ALT + DELETE to restart
or something very similar…

i tried going into bios and chosing the “fail safe defaults”. That didnt work. I also tried leaving it off overnight.

i just found my windows installation disk. So i put it in, went into recovery and did a chkdsk, which is currently running. But it has been on 50% for about 15mins now (i think it might be stuck lol), so i decided to ask you guyz for help whilst i w8.

thanks in advanced!

background: yesterday i decided to clean up my pc, (i was running out of space), so i went through some old folders n deleted stuff. i came across a movie file with a really weird name. so i opened it, and my computer restarted. And ever since it has been coming up with that message.

Also i dont think its relavant (and i dont think i spelt relavant correctly either), but when it was working, it couldnt recognise the second dvd drive. Thats never happened to me b4.

Thanks again!

note: im not very good with pcs - just thought u should know.
also i really dont want to reinstall windows - again.