I brougth this PC on Christmas, and it is as Asus K55VJ

I detected this problem on the past Thursday, 29/2.
The problem is the following: every 4-5 minutes the PC the mouse movement lags and the image and sound lags too, well the PC lags.
The lags only last for 1-2 seconds, and donīt know what is happening.

I checked the last programs I installed and they were Microsoft Office 2007 Enterprise and Microsoft Visual C++ 2005 Redistributable. Also the last updates were all security updates for Office.

I also checked task manager and during the lag the cpu usage jumped from 40s to 60s, and the task who used that is System

I wished you could help me.