Accidentally deleted /var folder, now recovery utilities not responding to trackpad/keyboard!

So I did something completed stupid, and now have a big problem.
I accidentally deleted /var folder and emptied the trash!!
Now my MBP is stuck at the grey start up screen with the apple & spinng wheel and won't start up..
The weird thing is, now when I enter recovery utilities, everything displays fine except I cannot click anything! The mouse pointer moves but won't respond to clicks! Same with the return on keyboard. Arrow keys work to move among 4 options on os x utilities (time machine/ reinstall/ online help/ disk utility) but when I hit enter, no response! The trackpad & return key works fine up until the point where the mbp asks which language to run the recovery utilities.
All my data is backed up online, and now I just want to reinstall os x and start using my mbp again!
I tried reinstall with an installation disc by holding down 'c' on start, then I hear the installation dvd spinning for 3 seconds, then it would start ticking and won't do anything else for a few minutes until I force shutdown.
Please!!! Can anyone help me?? How can I reinstall os x?? I would really appreciate!!
Thank you Thank you Thank you in advance.
-Michelle

I know it's late but maybe it will help other people.
I ran into the same issue and none of the solutions listed by apple helped.
I booted into single-user mode and I read the log in /Volumes/Macintosh\ HD/private/var/log/system.log, it was full of errors like theses
Dec 30 18:03:28 MacBook-Air locationd[352]: libcoreservices: _dirhelper: 454: mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n00000sm00006d/C/ modes[2]=0700: No such file or directory
Dec 30 18:03:28 MacBook-Air.local locationd[352]: could not create persistent store directory (Input/output error)
Dec 30 18:03:28 MacBook-Air locationd[352]: libcoreservices: _dirhelper: 454: mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n00000sm00006d/C/ modes[2]=0700: No such file or directory
The system actually tried to create directories in /var/folders but the directory /var/folders did not exists, so I created it:
Under single-user mode:
mount -o update /
cd /Volumes/Macintosh\ HD/
mkdir var/folders
mkdir var/folders/zz
reboot
And it booted just fine !

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