My recommendation:
1. Recover ALL your customer's data. Slave this drive and copy off all those irreplaceable photos, music, video of that Middle-School graduation, etc. (Have a Data-Loss Waiver AND recovery fee)
2. Look at the offine registry and Program Files to get a list of what software will need to be re-installed for the client. (You don't get paid for this, but it helps in the next step)
3. Get ALL the media from the client along with the Keys and any COAs etc. and CONFIRM what software you will re-install and with what licences and what that will cost. At this point you MAY need to recover keys with software and/or contact Adobe to de-activate software etc. This is where you will SET your expectations in writing and the work order <== What specifically will be re-installed. (i.e. The customer may have had dozens of B.S. things like Coupon Printer, Free Screensavers, etc... Obviously you only re-install bonafide things like Office, Adobe, etc.)
4. Replace failed hard drive with one one (labor charge & sale of replacement drive)
5. Install OS & Drivers & Activate & Updates & AntiVirus blah blah (labor charges or flat rate service fees)
6. Install ALL of customer's software as agreed, activate their software & update it, etc... (more labor charges)
7. Copy Customer's data back. (pretty much included in the data recovery above... unless you separate the two)
8. Get Paid
9. Return PC to happy customer.