Can't complete scandisk! any alternative?

Hi , I`m trying to Scandisk my 1TB MB essential because I cant acces to a certain folder

(window message:

"H:\folder is not accessible.     

Access is denied" )

the ploblem is that my pc freezes up while running Windows scandisk on my 1TB MB Essential so I can’t complete it. How can i complete the scandisk or  Is there a scandisk alternative?

im running WinXp sp3

I have 2 separated partitions. made with PQ partiton magic. both NTFS

thanks in advance