Windows 7 - A disk read error ocurred

....press ctrl alt delete

This started happening when I moved my OS partition to the left with Partition Magic, in other words:
I had a dual booting in the same HDD with 3 partitions, the I got rid of the first OS (Windows 7 ultimate) and used Partition magic to move my second OS (Windows 7 homepremium) to the left. Right now I have two partitions.
And it worked! Yesterday I booted the computer normally like 3 or 4 times. (with some errors that then dessapeard)

Today I booted the computer normally too, but then I did a restart and all of a sudden I have this error.

The strange thing is that yesterday that same error hapenned and then it dessapeared.
Another error that happens and dessapears is BootManager missing or something...
I tried windows disk to repair but nothing happens, but then all of a sudden it boots perfectly normal again..

I am sure that this is very simple, maybe i messed up with the hiddden partitions where boot manager is... I dont know


Weelll this is my little problem today
thanks a lot