Memtest86 and Memtest86+ giving different results?

Ok I did make a post about random reboots I've been having so I did Memtest86 (Windows) and Memtest86+ (Dos-like)

When I run Memtest86 in Windows, I get about 6 errors in the first 10 minutes. Last night I let Memtest86+ run for about an hour and a half, it did 4 passes with no errors.
So my question is:
Is my random rebooting an issue with Windows as I get RAM errors in Windows, because when I test prior to Windows booting, I get NO errors.

System Specs:
Motherboard: PC-A9RD480Adv
Processor: AMD Athlon 64bit X2 4600+
Graphics Card: ATI Radeon X1900xtx PCI-E
RAM: OCZ Gold PC-4000 (2x 1gb)
PSU: Enermax Liberty 620w
Network Card: Linksys Wireless G with Speedbooster
SoundCard: SoundBlaster Live! (KX Project Drivers)
Primary Harddrive: Maxtor 6L250R0 NTFS
Secondary Harddrive: Maxtor 6L200R0 NTFS