can i seal or expunge my criminal record

I would need to know more information than the question gives, but expungement in Virginia is fairly straighforward.  If the charge ended in a finding of "not guilty" or was dropped by the Commonwealth or was "otherwise dismissed" then it is entirely likely that it can be expunged with the proper filings and court appearances.  There are a few hoops to jump through and it can take several months, but if you qualify it will usually work out.  I do recommend having a lawyer help you with it.  Be advised however, that if you were convicted (found guilty or pled guilty) then in Virginia, at the present time, expungment is not an option.  Your question indicates that you were charged but does not say what the ultimate outcome of that charge was.  That fact will be very important in determining whether or not expungment should be pursued.