MacBook Pro: OS X reinstall is taking "forever", (over 12 hours) to finish This is my first time ever dealing with a Mac OS X reinstallation.
About a week ago, while working online, my MacBook Pro just started to be very very slow to do anything. I would get the WHEEL spinning for over a minute for each click on anything.

I looked for trouble shooting info and followed the procedures to use disk utility, etc. No issues with hardware were reported.
I only had like 3 issues with registry entries I believe.

I decided to backup my important files....took me 3 days because each click would take ages to be executed.

Now for over 18 hours, I'm waiting on OS X Mavericks to finish installing on my computer which is under 2 yrs old. 
Oh, after the initial stage of 'installation', the download and install, which took like 4 hrs, the computer rebooted (as was expected according to videos on yt).
However instead of going to the setup page, it went back to installation window which was supposed to take 24 mins initially but I'm still waiting 4 hrs later.

Is this common with Macs?

If not, what's the problem with this Mac and how can I fix this please?

I get the long wheel spinning even during this reinstallation and I'm totally baffled by this.

Thanks for the help.
This is not common.  I have never had this problem and I upgrade to every new version.

I always create a bootable USB installer.  Here are the instructions from Apple: http://support.apple.com/kb/HT5856.  This will let you check your disk and reformat.  I always reformat so that I know everything is the way it is supposed to be, but it is a bit more time consuming.