boy..........am I in a fix?

These are a few of the problems I am getting..........................
When I try to use
sfc /scannow
I get this message
---------------------------
winlogon.exe - System Error
---------------------------
Unknown Hard Error
--------------------------
When I get rid of the box, my pc reboots!
.................................................. .....................
When I try to view clock---------rundll32.exe - System Error
---------------------------
Unknown Hard Error
.................................................. ..........
C:\Documents and Settings\user\Local Settings\Temporary
Internet
Files\Content.IE5\WXOJ838R\everesthome[1].part2.rar
C:\Documents and Settings\user\Local Settings\Temporary
Internet
Files\Content.IE5\OLABST6N\everesthome[2].part3.rar
downloaded, but can't run it!
.................................................. ........................................
can't defrag, get the message--------
Disk Defragmenter
---------------------------
Disk Defragmenter has detected that Chkdsk is scheduled to
run on the volume: (C.Please run Chkdsk /f.
still doesn't work if I reboot.
.................................................. ..........................
Everytime I reboot, I get the message about running Chkdsk.
.................................................. ................................
If I try to run Chkdsk I get this
message.............---------------------------
Checking Disk Local Disk (C)
---------------------------
The disk check could not be performed because the disk
check utility needs exclusive access to some Windows files
on the disk. These files can be accessed only by restarting
Windows. Do you want to schedule this disk check to occur
the next time you restart the computer?
---------------------------
Yes No
....................
I have 26.3 used space and 38.4 free space.
Use windowsXP.
.................................................. ...................
I can't use the 'restore to earlier date'
.................................................. ..............
I really want to reformat the p.c.
I have back up drive (f) with two files in, restore.gho and resto001.ghs
I used to have an icon with a ghost on that I could click to start the reformatting program but it is nowhere to be found!
Am I a lost cause?
Will I be able to reformat my p.c.?
Any help would be gratefully received























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