1) On my Desktop I have an IDE Seagate Barracuda 7200.9 160gb hd. It is called H:/. This is annoying as everything defaults to C:/ and then says it has no space or something. How do I change it to C:/ (I have an external card reader that is currently called C:/.
2) What is the best way to transfer files over a wireless entwork. I have a laptop and a dekstop both connected tot he same wireless network. eg if I was working downstairs on my desktop and wanted to take my laptop upstairs, what would be the qcuikest way to have that file I was working on?
If your Seagate drive is your system (boot) drive then you can't easily change its drive letter. Your card reader will only be taking up the letter C: because it isn't in use. Whatever you try to do I would move the card reader to another letter as described in SANTOS7's first link so that it doesn't get in the way.
The only way I know to change your system drive to C: is to wipe the drive clean and reinstall everything. You may be able to create a partition backup with something like Acronis and assign a drive letter when restoring it back to the drive but I haven't tried this personally and there may be problems because the Registry will be pointing everything to H:.