Problem accessing my hard drives

I installed AVG antivirus and after running the scan, which led to quite a few threats being found and ironed out, I realised that the ironing out had infact been a bit too much.

Now i can't just open my hard drives the good old way i.e. Go to My Computer, Double Click on whatever drive to access. I get a message "OPEN WITH". Also can't even right click and then choose explore. This also gives the same result.

What to do?