hmm, are u on 98/Me?
why did u need the disk compression?
anyway, the command prompt looks like
C:\> and you cannot use commands like, scandisk C:, though you can use command like, as if your system has already DOS commands in it, then use:
assuming u r on C:\> already, just write scandisk, if still u dont have scandisk command in ur drive, then let me know, i'll uplod it for u on web, and u can download it later from there.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"