Hi Subroto, it probably means your Anti-Virus is still interfering with the 30-day trial's operation. The 30-day trial is wrapped with a layer called WinLicense that makes it more difficult for it to be reverse engineered but some Anti-Virus (ESET in particular I think) will mistakenly flag anything wrapped with WinLicense to be a virus.

The "no save" trial version is not wrapped with WinLicense which is probably why it's working ok for you. The full version is also not wrapped with WinLicense either so it's likely that it should be ok for you and should behave like the "no save" trial with your anti-virus.

- Michael