spyware and ram question?

I renently had a " new" motherboard installed along with 2 256 MB RD RAM.He told me that I had a "ton" of spy ware in my system and to constantly check for it, Currently I have spybot search,Ad- aware SE personal & XOFT spy.  used to run them like 3 times a week with not impressive results in getting spyware. Since I got it back, I run all 3 everyday and I get alot of spyware since my computer came back. I keep my firewall and antivirus on and updated. What am I doing wrong ? Regarding the ram, I used to have 128 MB now I have 512 MB RD Ram with ECC and I see no difference what so ever. I wasnt expecting much but if anything its the same if not slower ?  any ideas?  The person also removed all my firewall and antivirus software  from my starup menu and he installed something called " Intel Application Accellerator" which I dont know what it does yet ?? I thinking that the problem is that when he got the motherboard it wasnt a perfect match exactly because dell was apparently out of stock and didnt make them anylonger, I bought my computer in april of 2000. But I recently got My new Motherboard yesterday from dell and was wondering if I should have hime or someone install the right one? One last thing, ever time I boot up my computer the norton firewall is always disabled..anyway to correct this so when i boot up it is enabled? thanks in advance

Win 98 se..

 

Pat