I have a 1 year old Intel Dual Core (2.20GHz each) running on 32-bit Vista Home Premium, with 1Gb of RAM.
I've checked the 'start up' programs in the config file, and this is all that's running:

which doesn't explain the usage. I'm not sure why the OS shows up three times.
I'm fairly sure it didn't run this slow when I first got it, and I'm quite good about removing junk temp files.
Can anyone suggest the reason for this high RAM usage, or should I just buy some more?