I have a slow startup or login, with numerious spinning wheels. Sometimes after a long ti,e I can sign into the computer and sometimes it just fails to startup or login. I have a MacBookPro OS X 10.7.5 from 2011

I have a slow startup or login, with numerious spinning wheels. Sometimes after a long ti,e I can sign into the computer and sometimes it just fails to startup or login. I have a MacBookPro OS X 10.7.5 from 2011. It became more serious recently as I think I might have let my battery run out I also tried to download the operating system to reinstall it but it allways stops around 1.4 GB out of 1.7 then the whell starts again.

Keep the MBP attached to the power adapter.
First try SMC and PRAM resets:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
Then try to boot the MBP in recovery (OPTION key down) and select the recover partition.  Select Disk Utility>First Aid and verify and repair the HDD.
Additional steps can be found here:
https://discussions.apple.com/docs/DOC-3353
Ciao.

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