It is not usually advisable to plug a drive in after the system is on.
A "Startup Repair" is usually the choice for your situation. It runs the commands you have tried, but it may need at least 3 attempts to be able to repair a boot, if it can.
Since you have the system booted, have you tried just installing windows 7 again?
If your system will not boot with the drive, the drive might be bad.
And just to clairify, you are using your friend's computer with the one hard drive...
A "Startup Repair" is usually the choice for your situation. It runs the commands you have tried, but it may need at least 3 attempts to be able to repair a boot, if it can.
Since you have the system booted, have you tried just installing windows 7 again?
If your system will not boot with the drive, the drive might be bad.
And just to clairify, you are using your friend's computer with the one hard drive...
