Permission repair been running for almost 2 days now? What happens if i stop it? What to do? Please help. Thanks in advance.

You shouldn't be running Permissions repair booted from the install disc, in the first place. Stop it, shut down and Safe Boot. Hold Shift key down at startup chime. Give it longer to boot than usual. If you can get it to boot up, you must delete some things to make room. Likely candidates are in your home folder, music, movies, documents, pictures. The Safe Boot will, if possible, repair your drive.

If you don't want to lose them completely, you need to move them to an external drive. You should maintain at least 15-20% free of drive capacity.

You will likely have introduced real errors by repairing Permissions booted from the install DVD. You can fix them by running Permissions repair if and when you are in Safe Boot.

Try again. This time hold Shift down at the startup chime, or as soon as the computer starts up, not prior to it. If this won't work you may find it necessary to reinstall Snow Leopard. However, if you were experiencing a kernel panic (a message in several languages) when you were asked to restart, that may mean a hardware problem (there can be causes due to software issues, as well.) In additon, if you were so low on free disk space, I'm at a loss to know what will happen now if you try to reinstall.

Anyway, give another Safe Boot a try.

If you were able to get into Safe Boot -- a screen with "Safe Boot" in red letters would have appeared -- that should have repaired the drive. Next, just run Permissions repair, still in Safe Boot. (You can not repair the drive booted normally, that is, not booted from the install disc.) After running Permissions, you should free up some space on the drive, still booted in Safe Boot. Then see how things are working booted back normally.

I don't have automatic login set, so if you do, you may not see that login screen with Safe Boot in red letters. In Snow Leopard, I think you should have seen a progress bar, though, briefly at the beginning, which I think says something like "loading Safe Boot." In any case, if you held down the Shift key at the startup chime, you would have made it to Safe Boot.

I think it's time to stop Permissions repair -- looks like your system is completely out of whack -- and reinstall Snow Leopard. But before you do that you must make some space on the drive or reinstalling may not work. Boot back into Safe Boot to do this, if you can't get booted normally.

You are not erasing and installing. Boot from the install disc and just choose the option to install. This should give you new system files while preserving everything else. It would be better if you have a backup (preferably a full bootable clone on an external drive), but if you don't, you'll have to go ahead without one.

Forgot to mention, when you have finished the install, boot back normally and download the 10.6.8 Combo Update. Put it on the Desktop. Then follow these directons in my Recommendations for updating.

https://discussions.apple.com/thread/3139323?tstart=0

That's terrific news. You're welcome.