You didn't say how you set up the folder. If you are using Windows 7 or Windows 8 on your desktop, the best solution seems to be to set up a Homegroup. It was easy to setup and works well for me.
I assume your shared folder is on your desktop computer and not on the RT. How do you "go into my computer in the RT..." Did you "Add a network place" or did you "Map Network Drive"?
If you mapped a drive, your RT will try to open the drive every time you turn it on. It will wait until the Network Drive is available. If your desktop computer is off, it can take several minutes before it gives up.
If you Added a network place, you RT will only try to open the drive when you intentionally click/touch the icon. It can try for several minutes before it gives up but should not lock up your RT while it is trying.