Hi buddy,
man, this sounds REALLY...REALLY strange.
So, for better understanding:
You have malware on your system (C: drive), you want a working system? Right? But you want firstly secure some of your data?
Ok, it would be better to grab your hdd, go to the next electronic market and then buy a USB-HDD case. But first check if the pins fit (that was the suggestion to take your drive to the market to check THIS out).
Connect the USB-HDD to your another system, copy your files and then delete the WHOLE drive. The best would be to try this CD to format and repartition your drive:
www.ubcd4win.com
Then after completely removing all partitions, you can drive your recovery and get a working system back.
Greets