I recently installed Win7 and I started having this issue. After checking various sites and suggestions (including the screenshot posted here) nothing worked. Lastly, I tried resetting the priority of the program and thank goodness it worked.
Here is what I did:
* Opened Vent and signed in.
* Ctrl+Alt+Delete > Open Task Manager
* Under the programs tab > Right click the program and click on "Go to Process" (this take you to the process tab)
* Right click on the process, scroll down to Set Priority and set it to 'Realtime'
Unfortunately, I've had to make this change each time I login however I'm sure it can be fixed. Regardless though, this has eliminated the issue and I'm back to normal.