Linux Mint 14 Nadia installation problem. Help

[LU3lnx]

I'm new in Linux and have an installation problem. I'm trying to install Linux Mint 14 Nadia to my PC. I've downloaded linuxmint-14.1-mate-dvd-32bit.iso and make it work with unetbootin. Now is in drive C, and works fine so I want to install it, but here appears a problem. After selecting language (spanish, my language), having +6.1GB and Internet connection, and after choosing different partitions for /(root), swap and /home, and clicking on InstallNow, it begins the installation, but then appears an error window: "The installer needs to commit changes to partition tables, but cannot do so because partitions on the following mount points could not be unmounted: /cdrom -Please close any applications using these mount points. -Would you like the installer to try to unmount these partitions again?" Thera are 2 buttons: GoBack and Continue, but no one do nothing, and window don't close anyway. I must restart. There are no aplications opened. I've tried removing ubiquity-slideshow-mint from a terminal, but nothing new happens. I need help. Thanks for reading my poor english and for helping.

[catweazel]

Restart the installation, delete any partitions already created by the installer, then choose a single root '/' partition for the install. You only need root '/' and swap.

[LU3lnx]

thank you TehGhodTrole for answering. I have tried but there is no difference, the installation hangs at same point.

[catweazel]

Perhaps you should verify the md5sum of the iso you downloaded. Alternatively, if you haven't already done so, reburn the CD at a slower speed, say 8x.

[LU3lnx]

thanks again, TehGhodTrole, for your answers. Checksums are correct, btw.. I've tried 3 different .iso downloaded from 3 different mirrors. But I'm happy because finally I could install! . If interested, read how I did. The iso and unetbootin were in disc C: so I execute it, from inside windows xp. The live installation was created in C: and there was created mint4win. I wanted to install definitely in E: so i tried copying mint4win and the iso file to E: and executed mint4win from there. There was created amother live mint. I reboot and selected mint, from inside mint I click on Install Mint, and voilá!! It worked!! Now I have Mint 14 in drive E an WXP in C: (and still remains the live version in C: , i expect I can use it for testing in the future.. if need to) . Mint works great, is very fast, I'm learning and configuring it, but I like it very much! Thanks for your assistance, TehGhodTrole, and sry for difficulties understanding my english. I'm very happy with Mint and with this forum. Juan, from Argentina.