No details about your laptop, nor what the Blue Screen said. Most BSOD's (Blue Screens of Death), have a STOP Error code and that can be looked up for more details.
How was the problem resolved?
What do you mean by programs are not working properly?
You mention anti-virus but not which one you had before, nor which one you have now. Why do you think the old one wasn't doing its job properly?
What is D:? Hard drive, partition, CD/DVD drive?
My laptop started blue screening on start up leading to it looping. Safe mode or last settings options did not work. Got it taken care of but now OS seems in pretty bad shape. Programs are not working correctly, taskbar keeps disappering and locking, I can't drag folders on the desktop. Anyone else have this problem or know what is infecting it. Tried installing a new antivirus since obviously mine didn't do its job and D: is not reconized.