Sketchup Pro 2014 Not Responding all the time

[rainboworiver]

It worked fine only two days ago. Now both Sketchup Pro 2014 and Sketchup pro 8 stopping working.
main problems:

• can't save files. it hangs with "not responding" message.
• can't perform simple functions such as follow me without hanging.
• file size is very small

Recently I installed some plugins. I have removed those new plugins as well.

I have removed both versions of skethup. Re-Installed Sketchup Pro 2014. Restared my PC (windows 8).
Nothing works.

All these problems make sketchup unusable!

what else could I try?