On my computer, realplayer barely works, most of the time it produces all kinds of errors and windows shuts it down. it uses a lot of cpu, and leaves behind an entry which checks for updates all the time, which that too uses a lot of memory. Use a start up manager, or msconfig to disable the auto update from starting
The more recent versions of RealPlayer will let you disable the Message Center (which causes most problems for people). Try adjusting that and see if it fixes your problem. Also, the Enterprise edition is a severly trimmed down version of RealPlayer which causes a lot less conflicts and problems than the consumer product. Just a tip.

AJ