I'd suggest going to the Norton (symantec) website and searching for the 'norton removal tool' In my experience when uninstalling Norton it leaves loads of stuff behind and you need to run the tool to totally remove all entries for the program. I think it's called 'Symnrt'
Actually here is the link
http://service1.symantec.com/SUPPORT...&osv=&osv_lvl=
Then i'd run a chkdsk and see if the Hard drive is ok.... Open a command prompt (start>run> type in
cmd then hit enter. Then, at the C:\> prompt, type chkdsk /F and hit return.. The PC may want to reboot to run the check, this is normal...
this should give you something to get on with.....