It says error loading blkindex.dat? So what do I do I don't want to lose my precious coins I've been mining
Your block chain has become corrupt. You can either delete it (of course keep wallet.dat) and let the wallet download it again or open the wallet with -rescan.
ok but I downloaded the windows mirror qt from OP and now it's not there anymore to download? So how exactly can I rescan it? I'm that Noob when it comes to computers lol or if I delete everything but the wallet.dat and download the other windows wallet will I still have my coins because I have the wallet.dat?even though its a different windows wallet than the one I officially downloaded?
EDIT- I figured it out thanks for the help