Help! I accidently deleted some important programs from my PC!!?

First try restoring your computer to a previous point. Click on the start on, all programs, accessories, system tools, and then click on system restore. Then you pick a date and reboot. If that doesn't work you may have to do a system recovery, which would be erasing all of your hard drive and re-installing windows onto your computer. This can be very risky if you don't know what you're doing. I would try restoring your computer first though. Hope this helps