Welcome, u r at right place, so don't worry.
1>Why?? Why did u put ur HDD as slave?? Always put ur HDD in master, then anything u want to attach in the same cable as Slave. Don't alter this arrangement u'll be in trouble.
2>Go to "MyComputer"-->Tools-->Folder Options-->General Tab.
Here in the "Browse Folder" section, (I guess) it might be checked "Open Each folder in its own window", uncheck it and check "open each folder in same window"...this may solve ur problem.
3>how come u type by Mouse???

The problem might be with ur Kbrd, clean it properly and check if some keys are attached together.