Parent's Dell Dimension 8400.. Worth Juicing Up..? Or Is It Time...?

It has a P4 3.0 ghz in it (I believe)... All they ever do is surf the internet, and load some pics from their digital cameras on there... Is this a situation where I could rejuvenate the machine by simply reinstalling windows, and adding some ram..? Or, has this dinosaur seen its time come and go..? There's some stuff on Dell for $500, I doubt I can build one for that price...

Here are the build specs, most of it is superfluous, but I think it shows 1 gig of ram? (2) 512 chips? So there's room for up to 4 gigs, which I understand only 3 gigs would be used of on a 32 bit machine... :


2 T9364 Dual In-Line Memory Module, 512400M, 64X64, 8, 240, 1RX8
1 7N242 Keyboard, 104 Key, UNITED STATES..., Silitek, LC, MIDNIGHT GRAY...
0 149DF INFORMATION..., PREPARATION MATERIAL..., DEVIATION..., PRECISION WORKSTATION..., INCREASE..., #2
1 U7030 PLACEMAT..., GETTING STARTED..., 8400, CS/FSB, DELL AMERICAS ORGANIZATION...
1 N8757 KIT..., DOCUMENTATON ON FLOPPY DISK..., SOFTWARE..., POWERDVD..., 5.3.1012
1 X2749 Modem, V.92, Data Fax, Internal Donny, Dell Americas Organization
1 H8412 Kit, Software, Overpack, WXPHSP2 Compact Diskette W/Documentation English
1 T7166 Kit, Software, WP-PRDCT-STE12 English, V2
1 432GK Assembly, Bezel, BLANK ..., F3, Dimension, TRANSFORMER SKY DIVE MINITOWER...
1 U4931 Display, Flat Panel, 17, DUAL VOLTAGE..., E173FPB, MIDNIGHT GRAY..., DELL AMERICAS ORGANIZATION...
1 Y3392 HARD DRIVE..., 80GB, I, 8M, 7.2K, Serial ATA..., Maxtor Calypso...
1 F2854 Kit, Mouse, Personal System 2 2BTN, Wheel, Primax Electronics Ltd
1 F3988 Card, Graphics, 128, X300, Server Enhanced, MRMGA8
0 83535 INFORMATION..., PART, ADVANCED TECHNOLOGY ATTACHMENT PACKET INTERFACE..., DEVICE
1 U5945 Assembly, Digital Video Disk Drive, 16X, Half Height, Hitachi LG Data Storage, Chassis 2001
0 01323 INFORMATION..., NO ITEM
1 C3827 Processor, 80547, Pentium 4 Prescott DT, 3.4GHZ, 1 MEGB 800FSB, SKT-T
1 X7011 ASSEMBLY..., CHASSIS..., NON PFC..., TRANSFORMER SKY DIVE MINITOWER..., 350, PWA INTEGRATED..., MID-LIFE KICKER...
1 N6835 INSTRUCTION..., DEVIATE FOR CHAS L5.5/L6
1 W4254 Assembly, Heat Sink, PerformanceTransformer Sky Dive Mini Tower, TRANSFORMER METROPLEX DESKTOP...