Massive svchost.exe memory leak w/ nsi windows 7

Hi,

For the last few months my I am experiencing a large memory leak with svchost.exe (the one associated with process nsi). Operating systems is Windows 7 64 bit. The memory grows over a 1 week period to use most of the 8gb of available RAM. Only solution so far is to reboot and then it just starts building up again...help!

Thanks Much!!!