Your original post didn't have all the information and your problem seemed to point to a memory problem. Yes, a bad md5sum or even a bad burn can cause you to have a bad install.
I would check the md5sum. If you downloaded the cd/dvd iso then be sure to check the md5sum for the original iso. From the cli;
~#cd /downloadisolocation #cdromiso.iso cdromiso.md5
~#md5sum -c cdromiso.md5 #substitute the correct name to check
If the iso md5 is ok then you should try 'CdromMd5sumsAfterBurning'
This way you will know if the burn was OK!
This will check the download iso with the known md5sum that you also get with the iso. If the sum check is not OK then you might need to slow down the burn.