Computer CD/DVD drive not reading disks properly???

[Petie]

I noticed that the thingy that holds the lens was way too close to the center than usual, so I moved the thingy all the way in the opposite direction

I'm glad this seems to have worked for you but just for future reference, you should avoid touching the laser at all and especially with bare hands. The oil on your fingers can ruin the lens and make the drive completely inoperable. If you must touch the laser, do so with a soft lint-free cloth to avoid damaging it.