Is it OK two have more than one anti-virus/spyware programs scanning the computer at the same time? I have multiple running, I just want to know whether the scan gets affected in any way if there is more than one program doing it?
Two active anti-virus scanners will most definitely cause problems as both fight over access to files. You can have multiple AV suites installed as long as one, and only one, is designated as the live shield. Multiple malware programs don't have that problem.