I advise you to make sure the following, if not done:
1. Update the antivirus and do full scan along with start-up scan. Prefereably, Avast.
2. Also install Malwarebytes Antimalware software from google free version and do full scan.
3. If no virus found, then update all your Adobe Flash Player/Windows Updates /MS Office Updates (check whether you are on latest SP version of Vista/Win 7/XP whatever applicable to you) and Disable/ uninstall Java temporarily.
4. Go to 'Services.msc' option in Run command option. Make sure "Desktop Window Manager Session Manager' service is started and running.
5. Uninstall unimportant fake applications if any temporarily.
6. Upgrade Internet Explorer and Adobe Reader, if using.
7. You may also try the option of System Restore at the end.
8. Do Error-Checking in each drive's Properties option and fix them. Also use Ccleaner software and run n fix registry errors, if any.
After trying the above, if you still not able to fix the error, please let me know with your system configuration. I assume copy paste options are not working at al in your system in any application.