laurayuan

The "unable to reset your PC a required drive partition is missing" error usually occurs when the MBR or BCD record is corrupted. Basically, rebuilding the boot record will resolve the issue.

First of all, you can try running a Check Disk to scan and repair all bad sectors of the hard drive.
 
If check disk does not resolve the issue, you should perform a system reset using a recovery drive. please refer to this page. 

I would recommend either an imac or the Mac mini.
 
however, DON'T buy an iMac with ONLY a platter-based hard drive inside. TOO SLOW. You are going to be very VERY unhappy if you get one of these!

Get a fusion drive instead, even the 1tb fusion will be better.
The 256gb SSD (not sure if that option is offered on a 21" iMac) is best.
Don't let anyone tell you that "it's not large enough" You can add an external USB3 drive for project storage if needed, it won't slow you down at all.
 

I would recommend either an imac or the Mac mini.
 
however, DON'T buy an iMac with ONLY a platter-based hard drive inside. TOO SLOW. You are going to be very VERY unhappy if you get one of these!

Get a fusion drive instead, even the 1tb fusion will be better.
The 256gb SSD (not sure if that option is offered on a 21" iMac) is best.
Don't let anyone tell you that "it's not large enough" You can add an external USB3 drive for project storage if needed, it won't slow you down at all.
 

ain't my fauly --- zara larsson. i just can't believe its same person who sang symphony.
 

You can, but you will not get any security updates.  Also, newer software will often not be tested for compatibility with Windows 7 in near future.  

I'm using Windows 7 for five years and don't want to give it up. Is there any way to use Windows 7 and never upgrade to Windows 10 forever?