Try going to Start Menu > Run. Type in "msconfig" at the prompt and hit enter. In the System Configuration Utility Window choose the Startup tab, Disable any startup applications that are currently enabled, and restart the computer.
If the above doesn't resolve the problem, try disabling the paging file.
To do this go:
Start Menu>right-click on My Computer and choose properties> Advanced>Click Settings in the Performance area>Advanced>Click Change in the Virtual Memory area and select No paging file. Click on Set and choose OK in the open windows and restart the computer.