my guess:
1, you have way to many fonts installed (i know i do

)
2, you have spyware / virusses
3, your ram memory has become fragmented / doesnīt clear out the data of an program that you have shut down.
(i think pagedefrag could help for that)
4, you really abuse your pc
for clearing the RAM memory, you would have to mess in your registry and add an key
(donīt know wich one out of my head)
hope you understand what i just blabberd
