goto
http://msbetas.net/files/xp_cd_key_changer.zip look at the read me file and it has some cdkey that are valid. run the .exe and it will guide you through changing the key with prompts, ie 'scan for valid keys now? (y/n)'
or you could try these....
RHKG3-8YW4W-4RHJG-83M4Y-7X9GW (works)
QW4HD-DQCRG-HM64M-6GJRK-8K83T (works)
PQTHM-RWBHR-3BPVW-TFB22-V8HXQ (works)
KQC2B-X683R-2CDXT-PQ7HQ-47MPT (works)
JFQYM-YJQFQ-VBRCY-4VV7W-QRXBY (works)
KMTTB-68H32-8MKRK-GBHKT-RKCP6 (works)
CX7DD-4GX4Y-BTTR4-H88Y7-GQPWQ (works)
XP8BF-F8HPF-PY6BX-K24PJ-TWT6M (works)
8RCKG-36TH8-VWBGK-T3CB6-RHG48 (works)
7G4H4-T4XXW-BVXTH-4QP4V-9CV28 (works)
PG274-383QX-6C32H-P8RWC-48M4Q (works)
CWY3F-JGYHJ-W6KBG-3VYK7-DGG7M (works)
X6YWJ-M4TG2-DPGWJ-QCFR8-927M6 (works)
QCP6D-7VGVJ-JBKB4-DQMB2-9GTJ3 (works)
F7GV4-B7JGY-Q2KQW-6R8BM-FR8D6 (works)
HFVK4-TFWFG-4JKDH-H3FTT-8B23W (works)
HRPR7-WGJFC-VPHRB-XVFRW-2KPWY (works)
V3V63-3QW2G-JMFBY-8F4CM-PDMQW (works)
WX736-8YJCM-2JW33-4KJGY-XCDJ6 (works)
CQKYH-GKDJC-MJTWP-FPTJX-PKK23 (works)
CHYVW-V63RT-67XVC-XJ4VC-M3YWD (works)
XMDCV-2TJMR-7JD66-YTVMK-V7PBD (works)
RQHFJ-X47QJ-G2XKK-WYQ8P-7W6RG (works)
X6MYY-6BH3T-YRBT8-H8YPH-RG68T (works)
KVXQ3-RVQFG-FW8KC-2QYC6-67WCD (works)
KMM7J-FCXMM-WV8PG-6FQMD-CPTQD (works)
D6T24-3FBGM-WTDG8-6Y3WP-77QRJ (works)
V88FQ-MFFRR-8D2VY-PG87J-FG7PY (works)
XK39D-3PDMC-JMMDK-X8T8M-77YVM (works)
6G3J7-RQ233-FJGHD-GKYP4-QGKPG (works)
BKRFY-XPMQP-Y8PTW-BP6JM-B76FJ (works)
GP7DR-2T2CQ-JYW2M-DXTMG-DTQWY (works)
YWVHF-GT3M6-3QYB2-FCYCH-X47PQ (works)
QJ68H-G7T8R-WFR77-D8X8Y-VJ398 (works)
6KYDY-JT4MB-6V3JQ-4KKFG-P6C63 (works)
6JQPJ-84CFG-JCBQP-PVRJP-9G24Q (works)
MQ8JV-XXKVG-DB8V3-67WJB-RCB6W (works)
J3T66-JTP72-TGT7H-PMMWH-XM4K3 (works)
DB4H8-DQJJB-KXMWP-GPJVY-H7P6W (works)
38BXC-F2C4R-PXMXV-DBQXM-3C7V6 (works)
7FMM3-W4FMP-4WRXX-BKDRT-7HG48 (works)