I can't compile any class in Windows 7 C drive - Super User

i've installed windows 7 , want compile class in c drive, whenever try compile class i'm getting error(the following java):

  unknown.java:1: error while writing          unknown: unknown.class (a required          privilege not held client)           class unknown           ^ 1 error 

how can enable windows 7 compile class in c drive, can in other drive?

this can happen if permissions incorrectly set c: drive.

you can take ownership of drive so:

• right-click c: drive , click properties.
• go security tab.
• click advanced click owner tab.
• make note of current owner if want restore later in case
• in list of names select user name, or click administrators group.
• click edit , check replace existing inheritable permissions on descendants inheritable permissions object apply recursively.
• click ok, , click yes message:

this replace explicitly defined permissions on descendants of object inheritable permissions c-drive (c:). wish continue?

• wait until permissions replaced, click on ok.