I think your problem might be related to the limited amount of memory 32-bit Windows'es are able to access. If you were on XP 64, I'd tell you to stick with it and not downgrade your PC to 7Garbage or the 8th Abomination.
perhaps, but i already decrease the cache to 4Mb to avoid the "by the hell" comsumption of RAM of the start or the bitcoin core.
cache 4Mb = 200Mb of RAM used.
cache 100Mb = 1,2Gb of RAM used.