Follow these instructions -:
1) Open registry editor in start bar
2) You are seeing left pane now click HKEY_LOCAL_MACHINE and find a folder free called as " system " and now click control current set after this Enum and then USB.
3) Click find in edit menu at the menu bar and search for "Zunedriver"
4) Right click device parameters
5) If you click device parameters it will display the ragistry value under it.
6) Do registry editing
7) Removie the lumia 610 and re-inset it again
8) Now you can connect nokia lumia to pc as mass storage device
If you have any doubt then click on this link