I think it could be due to virus activity. Due to virus, there are few problem makes,such as the contents of the drive will be hidden, that's why user can't see or the files and the space available for use is less than the capacity and also can not open the drive or can not delete any file.
Your
pc already affected by virus ,you will need another pc to put the pen
drive.then you will format the usb drive.Actually an auto-run program
is running in your pc you can manually remove the virus .follow the
instruction.
http://amiworks.co.in/talk/how-to-remove-new-folderexe-or-regsvrexr-or-autoruninf-virus/
TO KNOW HOW It is suggested that go to
FOLDER OPTIONS - and select
SHOW HIDDEN FILES. It may show the hidden files. If can not show hidden file (tools >folder option >view> check on show hidden file>check off hide protected and check off hide extension) now can see all hidden file in c drive. If not think......
For ensure again
run >type> msconfig > hit can not open ms config if virus effected
run > type> regedit>hit>can not open registry if virus effected
run > type >gpedit.msc>hit can not open group edit policy if virus effected
If you don't have any vital data on the drive, just format it in another pc.Please note, before insert the
Pen drive .Go to run command from start menu OR Press Win key+R and type gpedit.msc and hit >Usser configuration>system>turn off auto play >eneble >use down arrow key seclect all drive >apply >ok. Control panel>administrative tools >service>select any word in right side and pres s for select Shell Hardware Detection> d -click >use down arrow key >disable >start.And now can insert pen drive and format. Hope this would fix the issue and you would be able to enjoy the full capacity of the disk. Try to be sure follow these.
you should fully scan by f-secure boo-table cd or any another anti-virus boo-table cd .Just insert the disk and restart.
Follow bellow the download link.
http://www.askvg.com/download-free-bootable-rescue-cds-from-kaspersky-bitdefender-avira-f-secure-and-others/Or you can another do it another way.
You should better to install quick hill and install for scan your HDD .
Here is the link =http://www.quickheal.co.in/downloads.asp
You should delete partition and create new partition and format your all drive.
Now install fresh O.S.
Hope this helps.
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