Bit of a strange one that!
Anyway, try increasing your pagefile / virtual memory size to see if it makes any difference.
To do this: Control Panel > System > Advanced tab > Performance > Settings > Advanced tab > Virtual memory > Change. Select 'Custom Size', & enter 1024 in both boxes. Click on 'Set' > Apply > OK. Reboot the PC & try again. G
P.S. What's the size of your hard drive, & how much free space does it have? Right-click the drive & select properties to find out