Need advice for total packages

For about 6 months, I've been supporting customers, ridding of spyware, trojans, worms, viruses, etc., a full time job.

Scenerio: I've got a customer with 30 users, and what would be the programs of choice (shareware) to accomplish what it is that I do with the following commercial programs, to keep costs under control?

1> NOD32
2> SpySweeper
3> CWSShredder
4> HijaakThis
5> Trojan Hunter
6> AdAware
7> SpyBot
8> MRU Blaster
9> EmptyTempFolders
10> SpyCop
11> WindowWasher
12> Registry Clean Expert

By using most of the dozen or so programs, I can usually clean all issues. But some are free, others for a cost.

Is there a process or software that does it all? Seems like some gets stuff others don't.

Guruuno