It is easier to determine the impact on the system or drives.
Example is one of the threat you got is the Netsky worm that have variants, but general info is similar to what Microsoft have on their malware encyclopedia:
The Netsky family is a mass-mailing worm that targets computers running certain versions of Microsoft Windows. The worm sends itself to e-mail addresses that it finds on the infected computer. When a user opens an e-mail attachment that contains a Netsky variant, the worm is activated. Some variants copy the worm to network-share folders. Some variants contain a backdoor component and perform denial of service (DoS) attacks.
If you are planning to get some stuff from the infected hard-drive using another PC, the clean PC must be up-to-date (so that known vulnerability that worm is using to attack won't work) and have an up-to-date antivirus that can detect such type of high risk threat.
That way, if the malware is blocked/prevented to do what it is coded/programmed to do, while you are retrieving some clean files from the infected hard-drive to the clean PCs' drive.
PC crashed; appears corrupted by "WORM.WIN32.NETSKY" and "TROJAN SPM/LX". Have these inconveniences chewed up the OS only or shall I write off the entire C: drive? How do I determine the extent of the virus? Will I make matters worse trying to salvage the two slave drives having data content only?
PC has three HD's. C: (master) had OS and some data; no partitions. Other two HD's are (slave) data only. OS= WinXP Home, SP3. My plan was to remove C: drive from PC; recon the HD and retrieve salvageable data files/folders that I could recognize while utilizing another PC. After I captured the data I wanted, I was simply going to reformat this HD and reload the OS. Am I looking for trouble as I attempt to retrieve the data only?
My original comments regarding the crash were posted in late Jan 2010. I just shelved the PC until I had more time to troubleshoot. Thanks for your input. Mr B.