The recommended spec's for Diablo 3 are :-

  Dragon_Heart 21:46 28 Feb 2011

Windows Vista / Windows 7
Dual Core 2.4Ghz Processor
2 GB RAM
512 MB NVIDIA® GeForce 8800 GTX or ATI Radeon HD 3870 or better

Those for Rift are :-

Operating system: Windows XP, Vista or 7
Processor: Core 2 Duo 2.2 GHz or better
Memory: 4 GB
Hard disk space: 8.0 GB available
Desktop Video: Nvidia GTS 250 or better
Sound: DirectX 8.1 compliant card
DirectX: 9.0c, June 2010 update
Broadband internet connection (DSL, cable modem or other high speed connection)

Based on that and your HD is not full you should be OK.

I would get myself more RAM and replace the video card when / if it fails

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