zeeshan.nayani :
So what will be the safest way in which I need to make sure I won't ruined someone's PC if I borrow it for this purpose..
If you're asking, then neither you nor your friend should attempt this.
If it were me:
Using a secondary laptop that I absolutely do not care if it gets virused up,
Said laptop is completely off the local network. No WiFi, no ethernet cable,
Using a USB dock for those drives
Boot up, and only after the system is booted, connect one of your virused up drives.
Investigate, and see what I can find.
Repeat with your other drive.
I might even do that from a Linux Live environment.
But the laptop I'd use has a full recoverable backup of the entire drive. If it gets screwed up, take about 20 minutes to fully recover it.
There is literally no data on that system I care about. It is simply a test box.
So unless you and your friend are really really comfortable doing that...don't.
It's like you're a doctor, and have to go into a room with a known infected Ebola patient. And you have to wear the whole isolation suit.