I've had my current computer for almost 7 years now, and it does give me the occasional problem. Since then I have upgraded my computer, to ensure that I can at least enjoy the web with minimal specifications and get my work done. All I use this computer for is work (Microsoft Office, Adobe PhotoShop etc.), web browsing, and managing web sites. Sometimes I do the little video editing.
Currently my specifications are:
Dell 1708FP (17" Screen)
Intel Pentium 4, 2.8GHz (Single Core)
1280MB SDRAM (1024MB + 256MB)
NVIDIA GeForce 6800, 128MB GPU
40GB + 10GB IDE Hard Drive