am using autocad 2007. i have problem when am opening new file from my autocad after save that file and close that file. when i will open again drawing will not come that error will come must_recover what can i do to recover this error. plsssssssss help me ppls  

Unfortunately this is a result of a virus attack. Locate any ACAD.VLX files and delete them.
 
See also:
http://usa.autodesk.com/getdoc/id=TS13717811