Problem installing Lion on my Macbook Pro.

Hello all. I bought the virtual lion upgrade from the Apple store a year and half ago, after installing it I noticed I coudn't use many applications I used daily. That lead me to reinstall Snow Leopard on my computer using my time machine backup.
After purchasing an external HD big enough to contain my Snow Leopard I decided to reinstall Lion and keep all the old applications on the Snow Leopard Partition on my external HD. Here is where all the problems began. After installing Lion again the computer coudn't get past the gray screen with spinning wheel. I remamber once during one of the many attempts it actually did get past the gray screen right after installing it but didn't last long since at night i turned off the macbook pro and by the morning the same problem happened.
Now after a long period of time I am willing to install that OS Lion on my mac even because I need it in order to install some applications that are not supported on Snow Leopard but the same problem happends...I have now used time machine to be able to get into my computer again and type this down.
Here is the current steps I already took:
- Backed up with time machine.
- Verified Disk
- Repaired Permissions ( right after the repair completes, if I click repair permissions again it starts reparing a whole load of new permissions and as far as I know could go infinitely...is this normal?!)
Additional information:
MacBook Pro 5,1
Snow leopard 10.6.8
Processor 2.4 Ghz Intel Core 2 Duo
Memory 4 GB 1067 MHz DDR3
Now I read that restarting the NVRAM and SMC might help and I was thinking about doing that, just not sure in what order and any help would be much appretiated.
Thanks in advance,
Gabriel

Little update.
I reset the SMC and NVRAM but it still not works. I also tried to Repair the Permissions under the Lion download using the "alt" key to access the Recovery HD and than I reinstalled lion under Recovery HD but still won't boot.

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