First check and make sure you have all the latest updates from MS, especially the important and recommended. The optional is for all other hardware and software on your system that you've installed, accept that as well. reboot system. (vista feature, in XP you had to go directly to the manufacturer) Then run any and all spyware, adware, malware software you have, run your AV scanner, run disk defrag software and registry defrag software then reboot system again. This will ensure that your system has no bugs and viruses and your hard disk and registry have been optimized. Once this is all completed then check to see if issue still remains.
Here is a list of some software if you do not have them all ready.
Auslogics disk defragger...