Start your computer in Safe mode.

1. click - start menu -> type %temp% enter

2. Delete all the files in the "temp" folder

3. Delete all the files in the "temporary internet files"

4. start menu --> type "msconfig" enter

5. Disable any suspicious start up entries from the list.

6. Restart the computer.

Hopefully your computer will be working normal , then reply here , i will tell how to remove those entries form registry permanently.

Thanks & all the best