Best way is to to boot your system in the safe mode by pressing F8.
1) Go to the My computer , select properties.
2) In the tool tab select perform error check and disk cleaning.
There is another way to get rid of this problem i.e software troubleshooting.
1) Spiceworks network troubleshooting tools are free where you can take help of this software.
2) Live boot is another one but not free.
If all this does not work than you may need to take help of technical or IT support service provider which can help you to provide online solutions and also with security updates.