[H] Strange Problem on Win7 system

[Steve Tomporowski]

My sister bought an HP Envy computer, which I had to downgrade from Win8 
to Win7 (64 bit).  She's legally blind, so needs a lot of visual help to 
see the computer.  However, that's not the question...

Somehow she screwed up the install, then trying to do a system restore 
only resulted in things getting worse, so I resorted to a reinstall.  
When I originally installed, I cleared out all the partitions, then 
created a new one, which meant, I had one for 100MB and another for the 
balance of the 1T disk.  Now, when I went to reinstall, there were 3 
partitions, the extra one was 78MB and suddenly they were all GPT which 
meant I could not install Win7 to any of them.  As far as I know, I 
shouldn't have been able to install Win7 to begin with if the partitions 
were GPT.

Any idea how this could happen?  I want to do something to make sure it 
doesn't again.  Right now, the only thing I can think of is that she got 
some kind of malware.

Thanks...Steve