Wow - This must be about the 5th question you have put forth today!
Once more, you do do design work, and that does put strian on computers, maybe non-perfect speed is something you will have to live with, or consider upgrading your computer.
The 1200 fonts wont be helping wither
But you should consider running some tests - and they are all free
:
- Anti-Virus run an on-computer one (e.g. Avast! Home) or an online test (e.g. panda security have one).
- Sypbot scearch and destroy.
- Ad-Aware SE
- Spyware Blaster
(Sorry, I am devoid of links, Google?
)