thanks for the advice sir leefrost. btw mine is a win7 32bit & 4gb ram not 64bit.
"For W7 in brief:
min size = RAM + 300mb = 3372mb (for 4GB of ram)
Max size = RAM x 3 = 9216mb (for 4GB of ram)"
That info. applies to the paging file of both 32bit or 64bit W7.