After Yosemite install MacBook Pro only starts up in Recovery Mode

Hi,
I installed Yosemite on my mid-2009 MacBook Pro 13" yesterday and when restarting it after the installation, it starts up in Recovery Mode. When I verify the disk in Disk Utility, it says there is no problem. I would reinstall OS X but it says I don't have enough free disk space do to that (I have around 9.5 GB). But in Recovery Mode I cannot delete files to free up disk space (at least I don't know how to do it). My latest Time Machine backup is quite old (my fault, I know...), so now I am stuck...
Could anyone help me, I am becoming quite worried and stressed now.:(
Thank you LOADS in advance!!!
kicilani

Some would consider what you have to be an adware issue, in that the product is of no
help to the Mac OSX, the computer, or your use of it as intended.
See this ASC discussion:
Re: Need help to remove adware downloader_setup_mac.dmg!
•Adware Removal Guide - manual removal methods:
http://www.thesafemac.com/arg/
•Adware Medic - from the author of thesafemac:
http://www.adwaremedic.com/index.php
Good luck & happy computing!

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Copyright © 2014, 2015 by Linc Davis. As the sole author of this work (including the referenced "Diagnostic Test"), I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

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