That 1 GB of ram is a problem, especially if you have a small paging file. Go to Start, Run, and type in cmd. Copy and paste the following lines into the command window:
wmic computersystem where name="%computername%" set AutomaticManagedPagefile=False
This line will disable the automatic management of the paging file size by Windows. Then copy/paste this line:
wmic pagefileset where name="C:\\pagefile.sys" set InitialSize=2048,MaximumSize=4095
This will set the paging file size range so that the system can adjust the paging file from between 2GB and 4GB as needed.
Post back if this doesn't work.