Crypt/modify a .sys ?

Hi,
Can someone help me with few information's please ?

1.How to crypt a .sys file ?(I try aspack, but after crypt stop working, windows didn't accept ).
2.How to modify size for a .sys ?(I know an exe/dll few methods) but for .sys after I modify stop working.
3.Have someone a ring 0 dll injector for 64 bit ?(rootkit method) ?

10x in advance !