There could be a number of common reasons for your problem and solutions. Most likely a program is blocking the subsystem process that allows you to copy & paste or your system has become corrupted.
Firewalls & antivirus programs can block system processes, turn these off and see if you you can now drag and drop. If this works you will need to edit their program control lists.
Lack of rescources can hang system processes, check how much hard disk space you have, if it's less than 5Gb free up some space and then defragment your hard drive.
Newly installed or upgraded programs can have undesired effects, try uninstalling or downgrading anything that has changed in the last week before the problem began.
The virus could have caused the problem and corrupted system files/registry reinstalling Vista would be the quickest way to deal with this.
At this point you could try reinstalling Vista from disc, a fresh install will solve most problems. Though I would recommend testing your hardware first, it's a less likely cause so you may just want to push on with the reinstall. If your doing a reinstall make sure you have all the drivers you need before you do this. Also ensure you have all the discs/download files you need to reinstall any programs you use.
Hardware problems could also cause this, if you know what make your hard drive is go to the manufacturers website and download a diagnostic tool. Install and run this and it will let you know if your HDD is damaged/failing.
If that's ok, test your memory with one of the free testing packages available on this site. You will need to let this run for at least 6 hours unless faults show up before this.
Hope this helps,get in touch if you are unsure...
I have a 2 year old laptop that has never had any problems until a few days ago.
I am now unable to drag/drop single files from folder to folder, nor can I create folders or send anything to the recycle bin. Whenever I try to do any of those things, a window opens with a progress bar and just never progresses. It says that it's "Calculating..." the time remaining and is always going at the speed of 0 bytes/sec. I have to force the progress window to end with the task manager and when I do, Windows Explorer freezes & restarts itself. The file then goes where I told it to go in the first place after all that, every time.
My CPU usage which used to be around 7-20 range, now never gets under 50 and is often times operating in the 90s and takes up 62% of my physical memory (1.24 GB) - according to Windows Task Manager.
I have Norton 360 & scanned all the files in my computer. It said it found a Trojan.dropper and I quarantined & erased it in Norton. I don't know where it came from or if it's the cause of any of this, but that's the only thing I can think of that started this. The problem has not gone away.
I have logged in under Safe Mode, and the drag & drop/delete file works then, but only then. I have tried to do a system restore a few times from a few different restore points and it claims to have worked, but still doesn't fix the issue.
I have all my files backed up on an external hard drive and am now just contemplating wiping the whole system. Will this fix my problem? If so, how do I do it? I am open to any of other possible solutions or suggestions.
Let me know if you need any more of my computer info, I could really use the help.