Frozen login screen even after restore and reinstall

When I am starting my MacBook Pro 15" (Mid 2010) I often have a frozen login screen (where I enter my account password) and the only thing I can do is press for seconds the power button. I have already tried to reinstall MacOS X Lion and even a restore from my time machine back up but the problem still appears. Is there anyway to resolve this problem? And is it possible to erase everything and reinstall Lion ?

Yes a clean install will erase everything in your hard drive.  Be aware you should have a clone backup (which I prefer) or a time machine backup so that the migration assistant can copy your user and all preferences.
if you mac already has lion installed you could
Restart your computer while holding the option key. After the startup chime you will see your available boot volumes. Choose Recovery HD. (You might be able to start up with command-r to boot directly into the Recovery HD emergency partition, but I have found that only the most recent Macs will respond to this key combination.) Once boot is complete, look under the menu bar's Tools for Disk Utility. Start up Disk Utility, choose your main hard drive partition, and reformat to your heart's content.
You won't be able to perform certain partitioning tasks when booted this way, but you can do nearly everything that you could do if you were booted from an external device or optical disc.
or another option is:
Make a bootable DVD or USB stick .  I will guide you through the steps:
If you don't have a copy of the install mac osx lion.app redownload again from the app store
Before doing this you should make a clone of your hard drive or have a time machine backup at hand, that is a very important step.
1. right click or control click on the lion install file and select show package contents.
2. Navigate to Contents>Shared Support
3. Inside there is an dmg image called InstallESD.dmg
4. Burn image to a blank DVD or usb stick with program of your choice (USB stick works faster while booting).
5. Restart holding option key
6. Select DVd or usb stick you just made.
I hope this helps.

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