Did you delete LimeWire from within the main C:\ directory or did you just delete the shortcut from out of the Start menu?
You may have picked up a virus or spyware file (especially if you updated from anywhere except the official LimeWire home site)
Try Running an Antivirus program over your whole computer.
This can cause all sorts of problems if you have been infected.
If you don't have an AV program you are just asking for problems.
Luckily for you there are many available including the very reputable AVG free version.