Recently I was getting physical memory issues on Windows 7 32Bit since it only allows 3.5gb of ram but I have 6gbs. Where as scvhost.exe was hogging about 1,500,000KB's which is about 1.5GB's of memory most of the time which ate up a lot of physical memory.
I decided to reformat my computer to Windows 7 64bit which allowed me to fully use my 6gbs of ram. But scvhost.exe still hogs up around the same amount. I'm not sure if its normal or not, but I wanted to check because I've never really had this problem & I did notice my computer being a little slower than normal.