evil ad/spyware eludes termination

i have a user on an older pc running win98se who has an ad/spy/malware sending packets to ads.180solutions.com,, so far it has eluded all attempts to scrub it from the system.. the closest i have come so far is using system mechanic which finds 1 instance that it says is clickspringpurityscan which when deleted requires a reboot which upon boot up is still there on a rescan.. i’ve tried finding it in the registry,, msconfig,, winini,, startup,, add/remove programs,, using different combinations of both names of the adware.. anyone have a clue?? unless i can nail this one i see only reformat/reinstall in the future..