Some users are complaining that when they open My Computer drives by double click or right click and Open then it does not open Drive contents and some thing else opens. There are two solution to it try both.
A related post is here Get Open With Dialog When Opening Windows Drives
This problem can be due to autorun.inf file present in the drive or corrupted registry.
This problem was solved by Smart Virus Remover
But Some people again complained that it did not fix the problem so I have finally came up with a registry fix.
After running it do a favour to me by adding comments on this page
Download Registry Fix For Windows XP only
download the file drive.reg