Windows 7 OS in boot loop, wont start

I am running Windows 7 Ultimate on a HP Pavilion M9080N. About a week ago the computer went into a Startup Repair loop and Windows would not start. The message I kept on getting was "Startup Repair cannot repair this computer automatically".
I performed numerous system restores back to the first restore point, but it stil went into the Startup Repair loop.
One of the lines in the Repair details said "Root cause found: Boot critical file C:\Windows\system32\drivers\atapi.sys is corrupt. and another said "Root cause found: Boot critical file C:\ataport.SYS is corrupt.
I tried replacing it with a good file from the Win7 install disc by going into command prompt and typing "copy X:\Windows\System32\Drivers\acpi.sys C:\Windows\System32\Drivers\acpi.sys" and copy X:\Windows\System32\Drivers\apaport.sys C:\Windows\System32\Drivers\apaport.sys
I now get the OS restart loop without actually starting. When I restart with the Windows 7 with the install disc it continually searches for the problem and seems to fix it but when I restart it goes back to the OS restart loop without actually starting.
So I implemented the following on command prompt, as per Microsoft support article http://support.microsoft.com/kb/927392/zh_cn/en-us:

• bcdedit /export C:\BCD_Backup
• c:
• cd boot
• attrib bcd -s -h -r
• ren c:\boot\bcd bcd.old
• bootrec /RebuildBcd

Which did not work. Now the OS is in a boot loop, where I get the Windows Starting screen, which then goes to a blank screen with just the cursor then it re boots to the Windows Starting screen again. Appreciate any help to fix this problem.
Cheers

Try restoring a pristine copy of the registry from the regback foldet as explained in the later stages of this tut.

Startup Repair Infinite Loop Recovery

If that doesnt work, run sfc scan a few times and failing that a repair install.

SFC /SCANNOW Command - System File Checker

Repair Install

I can't promise this will work, but you might want to try the following command prompts while you're in the recovery environment.

Open an elevated command prompt and type Bootrec.exe then press Enter.

Now type /FixMbr
This command doesn't overwrite the existing partition table, but repairs a corrupted master boot record.

Next, type /FixBoot
This command writes a new boot sector to the partition.

Last, repeat /RebuildBcd
This command completely rebuilds the BCD store.