Page File size
1 Gb RAM should be enough, so I'm suggesting checking your page file size.
The page file (pagefile.sys) is a hidden file on the hard disk that is used by Windows to retain temporary data when your system is running low on RAM. The page file is also known as paging file or swap file. Virtual memory is made up of page file and RAM.
The recommended page file size is equivalent to 1.5 times the amount of RAM up to a maximum of 4,095 MB. This means that the largest paging file size per volume that you can set is 4,095 MB.
If RAM times 1.5 is less than the current maximum page file size, and RAM times 1.5 is less than 4,095 MB, it is recommended that you increase the size of the page file size.
Note
To prevent page file fragmentation, it is recommended that you set the paging file size initial and maximum values to be the same value. If you decrease the size of either the initial or maximum page file settings, you must restart your computer to see the effects of those changes. Increases typically do not require a restart.
To change the page file settings
1.
Click Start, click Control Panel, and then click System.
2.
On the Advanced tab, under Performance, click Settings.
3.
In the Performance Options dialog box, on the Advanced tab, under Virtual Memory, click Change.
4.
Under Drive [Volume Label], click the drive that contains the paging file you want to change.
5.
Under Paging file size for selected drive, click Custom size, and enter the recommended page file size in megabytes in the Initial size (MB) and Maximum size (MB) fields, and then click Set.
For further reading check here:
http://www.microsoft.com/technet/pr...BPA/d9dd689e-6a51-4751-bb28-bf2ab3a78c3c.mspx