No, not really. 64-bit operating systems are more than capable of running 32-bit anti-virus/malware programs just fine plus most other 32-bit programs. A few older 32-bit programs may need to be run with compatibility mode available in the Pro and Ultra versions of Windows 7 I believe.
temp. sig: standard RAM module timings example list, ala
CAS latency - RAS to CAS Delay - RAS Precharge - Active to Precharge Delay(also called Active Precharge delay and RAS Active time)